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The Element Encyclopedia of the Psychic World: The Ultimate A–Z of Spirits, Mysteries and the Paranormal
The Element Encyclopedia of the Psychic World: The Ultimate A–Z of Spirits, Mysteries and the Paranormal
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The Element Encyclopedia of the Psychic World: The Ultimate A–Z of Spirits, Mysteries and the Paranormal

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Alectromancy was also practised by listening to the crows of a cock and the periods at which they were heard. Another method was to recite the letters of the alphabet, noting those at which the cock crowed.

A well-known story involving alectromancy is that of the Roman emperor Valens, who used alectromancy to divine the name of his successor. He always got the name ‘Theod’, and so Valens ordered all those with the name Theodorus to be killed. Had he done his research properly, however, he might have been more successful: it was a man called Theodosius who actually succeeded him.

ALEUROMANCY

Divination through sortilege of fortunes written on slips of paper inserted into balls of dough and baked, mixed and distributed randomly. Used mainly by the ancient Greeks it is seldom practised today, although it is the origin of modern-day fortune cookies.

ALLHALLOWS EVE

See Halloween.

ALOMANCY

A method of divination that interprets random patterns of salt. Little is known of this ancient art of divination, but it accounts for some of the modern salt-related superstitions, including the saying that bad luck is likely when the salt cellar is overturned and the practice of throwing a pinch of salt over the shoulder for good fortune.

ALTERED STATE OF CONSCIOUSNESS [ASC]

The term ‘altered state of consciousness’ was coined by parapsychologist Charles Tart (b.1937), and it refers to a shift in the pattern of consciousness or normal waking state, for example during hypnosis, trance or dream state, when the conscious mind is subdued and the unconscious takes over. The operation of some psychic phenomena depends on being in an altered state of consciousness, but ASCs are difficult to study because of their subjective and internal nature, and because there is no universal state of consciousness from which to begin such a study.

States of consciousness take place in four levels of brain-wave activity: beta, alpha, theta and delta. Beta level is complete waking consciousness. Alpha level is where material from the subconscious is available to the mind, as in meditation or daydreaming. The theta level is equivalent to light sleep, a state of unconsciousness in which one is vaguely aware of what is going on around one. The delta level is deep sleep.

Many ASCs can be differentiated, ranging from dreaming to trance to mystical states of consciousness, such as that experienced during a shamanic state. ASCs can occur spontaneously or can be induced through disciplines such as Yoga, Zen and other forms of meditation, prayer and magical techniques. They can also be induced through chanting, dancing, fasting, sex, hypnosis, trauma and sleep deprivation.

Orthodox science largely rejects the experiences and knowledge gained from ASCs, many of which are intensely spiritual in nature, but scientific research has been effective in the areas of dreams, meditation, biofeedback and drug-induced states. Laboratory tests since the early 1950s on ASC-induced techniques such as relaxation, hypnosis and meditation have also been shown to enhance psi function, especially extrasensory perception (or ESP).

ALTERNATIVE MEDICINE

Medical or health practices based on unconventional principles, methods, theory, practice, treatments and knowledge -unconventional in that they are not in line with standard, traditional or orthodox medical practice and scientific beliefs. If the alternative therapy is offered alongside orthodox medicine it is called complementary medicine.

Alternative medicine is often (but not always) based upon metaphysical belief. Some of the most popular alternative techniques that incorporate metaphysical beliefs include acupressure, acupuncture, aromatherapy, Ayurvedic medicine, body cleansing, bodywork, chelation therapy, chiropractic, craniosacral therapy, energy medicine, electrodiagnosis, herbalism, holistic medicine, homeopathy, iridology, macrobiotics, naturopathy, osteopathy, polarity therapy, psychic healing, reflexology, Reiki, Rolfing, subliminal tapes, therapeutic touch and traditional Chinese medicine.

AMERICAN GHOST SOCIETY [AGS]

A society of ghost investigators with members throughout the United States and Canada. The society was formed in 1995 by Troy and Amy Taylor, as the Ghost Society of Central Illinois. It expanded quickly and became the American Ghost Society in 1996. Within a few years it had nearly 500 members, including many prominent authors, law enforcement personnel and paranormal investigators.

The AGS maintains a network of area representatives and local research groups, and the Taylors organize annual conferences and meetings. The AGS publishes a magazine dedicated to ghosts and hauntings, the quarterly Ghosts of the Prairie, and also operates a website (www.prairieghosts.com), which includes the largest Internet bookstore dedicated to the subject.

Membership of the AGS is open to all, and the emphasis is on a high standard of investigation of hauntings using detective work - visiting and inspecting sites, interviewing witnesses and using high-tech ghost detection equipment. Psychics and mediums are not used because they are considered too subjective. All data, once analysed, is presented to the public. The following is an extract from the AGS mission statement:

The American Ghost Society is a national network of ghost hunters and researchers who conduct investigations into the paranormal in a non-metaphysical manner. One of our main goals is to seek out allegedly haunted locations and to assist those who are experiencing problems with the paranormal. The group members then look for authentic evidence of the paranormal and try to determine if the location is haunted. We are seeking genuine evidence and are careful about the presentation of this evidence … insuring that it is legitimate, researched, and analyzed before being presented to the general public … The credibility of the group is maintained above all else as we do not work with psychics or conduct investigations using metaphysical methods. We are not ‘Ghost Busters,’ but when a case does prove to be genuine, assistance through other channels may be provided at the location owner’s request … In addition, we do not claim to be experts in the paranormal, as no experts exist when it comes to the supernatural, no matter what anyone may claim or who may claim to be one. We are instead working to present an image of competent researchers who are collecting the most authentic evidence possible. Investigations conducted under the auspices of the American Ghost Society are always held to the standards of the group and are conducted with integrity, honesty, and with discretion.

The Taylors opened the Haunted Museum in 2000 in Alton, Illinois. The museum houses a collection of books, articles, photographs and materials concerned with ghost research. Prior to the museum’s opening, when the displays were being prepared, several strange phenomena were reported at night. Lights that were switched off were mysteriously turned on by the morning, books fell from shelves, items would vanish one night and reappear the next and displays were rearranged. Curiously, the building’s alarm system was never activated to indicate the presence of human intruders.

AMERICAN SOCIETY FOR PSYCHICAL RESEARCH [ASPR]

Founded in 1885, the American Society for Psychical Research is the oldest psychical research organization in the United States. It investigates psychic or paranormal phenomena through scientific means. Among its founders was the Harvard psychologist and professor of philosophy William James while among its benefactors was the inventor of the Xerox machine, physicist Chester Carlson. Its library and archive contain rare books, case reports, letters and manuscripts, which date back to the 1700s.

The ASPR serves as a global information network, providing publications and educational services which offer ‘responsible information about relevant contemporary and historical research’. It has an exhaustive library of information on almost every experiment conducted on just about every type of paranormal phenomena. You can visit the society in New York City or look it up on the Internet: www.aspr.com.

See also Society for Psychical Research.

AMHERST HAUNTING

The Amherst Haunting is a tale of poltergeist activity that took place in Amherst, Nova Scotia, in 1878 and centred on a 19-year-old woman, Esther Cox, recently threatened with rape. One night, soon after the traumatic event, Esther started to feel ill and went to bed early. Later she woke up screaming that she was dying. It is said that ‘Her eyes went bloodshot, her hair stood on end, and her body puffed up to twice its normal size.’

Strange, violent movements filled the small, two-room cottage where Esther lived with her extended family. Thunderous bangs erupted from under the bed. Sheets were ripped off her and tossed into a corner. A doctor who came to examine her watched a bolster move of its own accord. Along the wall he watched words a foot high being scratched into the plaster: ‘Esther Cox you are mine to kill!’

The disturbances in the house continued, including terrifying claps of sound and unexplained fires - lit matches materializing out of nowhere and dropping on to beds. After some time, the longsuffering landlord decided he’d had enough of his property being damaged and asked Esther’s family to leave. She alone left instead, finding work at a nearby farm, but her job was cut short when the barn erupted into fire and the farmer had Esther charged with arson. She was sentenced to four months in jail, of which she served one month before being released. The story ended happily, for the disturbances subsided after Esther was freed from jail and eventually ended completely. Later she married, twice, and finally died in 1912 at the age of 53.

The case was never solved. Some at the time put forward the theory that electricity was responsible. Electricity was a new notion at the time, the latest wonder of the age, and people did not yet understand how it behaved. Some theorized that the unexplained fires were bolts of lightning and the noises were thunder.

In light of modern theories of the origin and nature of poltergeists, it is likely that Esther was the focus of psy-chokinetic energy, in which repressed emotions and sexuality burst forth, causing the phenomena. The case remains unusual in that Esther was beyond the age when poltergeist problems tend to occur, and that the disturbances also occurred in her absence.

AMITY VILLE HORROR

The Amityville Horror, although now considered a hoax, remains one of the most sensational and controversial cases of alleged haunting of all time. A small house in Amityville, New York, had been on the market for a year at a bargain price because it was the scene of a mass murder, by 23-year-old Ronnie DeFeo of his father, mother and younger siblings in November 1974. George and Kathleen Lutz bought the house a year later, in December 1975, and moved in with their three children.

A month later the Lutzes fled the house, never to return. They told the media of bizarre happenings - mysterious odours, doors slamming shut, gelatinous substances oozing out of nowhere. In 1977 The Amityville Horror by Jay Anson was published by Prentice-Hall as a non-fiction book. It sold six million copies and led to a top-grossing movie in 1979 and a host of other books and films.

The haunting was quickly dismissed as a hoax, and while it is possible haunting may have occurred, sceptics argue that there are too many discrepancies. The American Society for Psychical Research found the whole matter questionable and did not investigate, believing that the incidents were not paranormal. Also, when the Lutzes moved out the house became quiet. The next owners, Jim and Barbara Cromarty, said they experienced no unusual phenomena. However, they grew so annoyed by the tourists flocking to see their house that they sued the Lutzes, Anson and Prentice-Hall for $1.1 million. They won a settlement for an unspecified lesser amount, with the judge ruling that ‘the evidence shows fairly clearly that the Lutzes during this entire period were considering and acting with the thought of getting a book published’.

AMNIOMANCY

From the Latin amnion, meaning membrane, amniomancy is an ancient method of divination by means of the membrane that sometimes envelops the head of a baby at birth. From inspecting the membrane, called a caul, the diviner predicted what sort of life the newborn would have.

AMULET

An object, drawing, inscription or symbol believed to have supernatural or magic power to ward off evil, the evil eye, disease, poor health and other misfortunes. Amulets are also worn to bring good luck as a kind of mascot or lucky charm.

Amulets are typically worn around the neck in the form of jewellery or a charm - a magical phrase, rhyme or prayer inscribed on paper. Amulets are also worn as rings. Some amulets are found as designs, symbols or inscriptions engraved on doors or posts.

Simple amulets have a colour or shape that catches the eye, but almost anything can become an amulet depending on a person’s beliefs and resources. Among the most common are gems and precious stones fashioned into jewellery or statues of animals. Representations of eyes are also common and one of the best-known amulets is the ancient Egyptian Eye of Horus, which guarded health and protected against evil spirits. Organic amulets such as fruit, vegetables, berries, nuts and plants are common in some parts of the world. For example, the use of garlic as an amulet against evil may be traced back to the ancient Romans, while peach wood and stones are considered strong amulets against evil spirits in China. Certain metals are believed to have protective properties. Iron, for example, is universally thought to keep away demons and witches. Written amulets such as formulas, spells, words of power, secret symbols, religious phrases or signs have also been common since ancient times. See Talisman.

ANCESTOR WORSHIP

Ancestor worship involves paying respects to the spirits of dead relatives or ancestors in the hope this will ward off evil and bring good fortune to the community.

As the ancestors are not really thought of as gods, ‘worship’ may not be entirely the right term to use. Typically, offerings of food or drink or gifts for the spirits of the dead are made in the hope this will please the ancestors and make sure that they continue to look out for the community. In West Africa each family has its own ancestral shrine, inhabited, it is thought, by the founder of the lineage. These shrines are often carved in the likeness of the founder and must be tended and cared for.

See also Day of the Dead.

ANGEL

An immortal supernatural being which mediates between God and humanity. Angels are specific to Judaism, Christianity and Islam, but they occur as helping spirits in other traditions.

The word ‘angel’ comes from the Greek angelos, ‘messenger’, and the name refers to one of the angel’s most important duties, which is to travel back and forth between the celestial and earthly realms, bringing human prayers to heaven and God’s answers to earth. Angels are representatives of God on earth, delivering divine messages or helping humans according to God’s will. Angels exist in a celestial realm but have the ability to assume a physical form and pass as human beings. They may bring fire or bright light; sometimes they are pictured with wings and sometimes without. Where appropriate, they appear to humans in visionary experiences or dreams.

Prior to the Western Enlightenment, angels were believed by many to play a magical role in daily life. However, after the scientific revolution angels were no longer taken seriously except by poets and the romantically inclined. The mystic Emanuel Swedenborg, among other occult figures, claimed to commune with angels. Swedenborg called the souls of the dead ‘angels’ and said he visited them in the afterlife during his trances.

Today angels have made a comeback in popularity, due in part to a widespread spiritual hunger for supernatural assurance and guidance. Some people consider the appearance of a spirit of the dead, such as a family member, to be an angel that comes to warn or comfort them. In deathbed visions the souls of dead friends and family members who come to help the dying person are often believed to be angels. Many people still claim to experience angelic visions, especially those who have gone through near-death experiences, and in many such accounts an angel greets them at the threshold of death. Angels are most often sensed through clairaudience. They sometimes manifest as balls of brilliant white light or appear as real persons in a mysterious encounter with a stranger. These encounters often occur when a person is in crisis and needs decisive action. A mysterious, calm but firm stranger who is knowledgeable about the crisis appears out of nowhere and offers a solution. Once the problem has been solved the person vanishes. It is the abrupt and strange disappearance that makes people wonder whether they have been helped by a human or an angel. Famous examples of reported angel encounters include those of George Washington, who suggested that angels helped him during the Delaware crossing of 1776, and the composer Handel, who believed angels helped him to compose the famous Hallelujah Chorus.

ANGELS of MONS

See Battlefield ghosts.

ANIMAL PSI

Animal psi is the ability of animals to experience clairvoyance, precognition, telepathy and psychokinesis.

Are animals clairvoyant, and can they communicate telepathically? Do they possess special powers that enable them to sense danger? Although it is not known conclusively if this is the case, scientific evidence suggests that, if psi exists, it probably does so in both humans and animals.

Sceptics argue that animals thought to possess psi are simply responding to subtle changes in body language and physical cues from their owners, but many animal lovers are certain that psi exists in animals and that psi-gifted pets are those that are the most loved, as love nourishes psi. Many psychics like to have animals accompany them when they are investigating haunt-ings because animals are thought to be more sensitive to ghosts and spirits, and many cats and dogs have been known to react visibly in fear in places of suspected paranormal activity.

Evidence for animal psi is largely anecdotal, as animals do not respond well to scientific testing for psi. However, American parapsychologist J B Rhine at Duke University investigated around 500 reported cases of animal psi. Rhine concluded that there were five basic types of animal psi: the ability to sense death or injury to a loved one; the ability to sense the impending return of an owner; the ability to sense impending danger; the ability to find the way home; and the ability to psi trail’ or to find an owner when separated by long distances.

There are also numerous reports of animal hauntings, in particular stories of much-loved pets who have appeared to their owners to offer comfort and love. The stories remain anecdotal, but animals have and always will be associated with the supernatural and paranormal. Strange and mysterious stories of dragons, snakes, cats, dogs, serpents and unicorns linger among superstitions and fairy tales today. Religion, folklore and witchcraft have borrowed heavily from the animal world, for they know that the qualities and energies of animals represent strength, power, devotion, intuition, intelligence and wisdom.

ANIMISM

Animism is rare today, but this very ancient way of perceiving the world may once have been universal. At the root of magic beliefs and practice, animism is the belief that every natural object, both living and non-living, has a spirit or life force and is endowed with reason and intelligence. The animist sees movement in trees, rocks, streams, wind and other objects and believes that everything is inhabited by its own spirit.

Animism is found among many tribal societies throughout the Americas, Asia, Australia and Africa. Having observed that during sleep and dreaming, visions and trances - what today we call out-of-body experiences - the spiritual part of a body could detach from the physical, animists deduced that it could also survive death. Instead of going to the land of the dead, the soul might take control of another person (possession) or send messages to the living through mediums or shamans. It might lodge in various features of the natural world such as trees or rocks, or in human objects such as spears or statues.

Beliefs that a person may have more than a single soul are not unusual. For instance, among many Eskimo groups, a name is one type of soul. In societies that lived close to nature not only people but also animals and plants were thought to have souls, and human spirits might be reborn in animals (reincarnation). In some cases people may have a special affinity with certain species of animal, and the animistic beliefs concerning this human relationship to animals are known as totemism.

For the animist, the world abounds with spirit entities. Water spirits and forest spirits are especially common, but animism is more than just a belief in soul and spirits; it has its own logic and consistency and in many respects can be called a religion.

ANKOU

Ankou is part of the fairy lore of the Celtic countries. He is thought to be the personification of death, who comes to collect the souls of humans when they die. Largely forgotten in Cornwall, Wales and Ireland, Ankou remains a part of the living folklore in Brittany. Every parish in Brittany has its own ankou.

An old Irish proverb says, When Ankou comes, he will not go away empty’ He is depicted as a tall, dark, haggard figure, wearing a black-robed costume pulled up high about his head and with a large hat that conceals his face. Legend has it that he is always preceded by a gust of wind and you cannot see his face, for if you do it means you have died. He is said to drive a small black coach drawn by four black horses and accompanied by two ghostly figures on foot. Many believe it is not really a coach at all but a hearse and that the job of the ghostly figures is to collect corpses and place them in the hearse.

One legend says that Ankou was once a cruel prince who met up with Death in the forest and challenged him to a contest. The prince loved to hunt and kill, and on this particular night he was chasing a white stag (a magical animal in Celtic stories). The prince set out a challenge before the enormous, black-robed rider: whoever could kill the stag would not only keep the meat but also determine the fate of the loser. The stranger readily agreed, and it is said that his voice was raspy, like leaves scraping castle walls.

They set off at a gallop, and the prince realized immediately that he was bested. No matter how hard he rode, the stranger rode faster. And when the prince was still stringing his bow, the stranger had already set loose his arrow and felled the stag.

As the winded prince approached the stranger said, ‘You can have the stag - and all the dead of the world.’ The stranger sentenced him to an eternity of hunting the souls of all who died around the world.

ANTIETAM

The American Civil War battle of Antietam took place near Sharpsburg, Maryland, on 17 September 1862. Twenty-three thousand men were killed or wounded -the bloodiest single day of battle in American history - and ghosts and strange phenomena still greet visitors to the site today.

George B McClellan, commander of the Federal Army of the Potomac, had not yet been victorious for the Union because of his cautious tactics. Robert E Lee of the Confederate army therefore determined to occupy Northern territory and marched his men into Maryland.

But Lee’s luck was about to run out. A copy of Lee’s field orders had been lost, just about the time Union soldiers spotted a small packet lying on the ground. Opening it, they found three cigars wrapped in paper. The cigars themselves were rare and valuable, but only later did they truly realize what they had: the paper wrapped around the cigars contained Lee’s field orders. McClellan went on the march.

When the two sides came face to face at 5 am on the 17th, both generals were determined to make a stand and change the course of the war. The battle was fierce and frenzied. By late afternoon, thousands had died and, although both sides claimed a victory, in actuality it was a draw. It did change the course of the war, however, for Lee’s failure to successfully invade the North led to Britain postponing its recognition of the Confederate state.

Today the battlefield looks much as it did all those years ago. Some woods have been cleared away and monuments erected, but you can stand on the site and perhaps experience what other visitors have reported - hearing the sound of gunfire and smelling the scent of gunpowder. One visitor to the park saw what he thought was a group of Confederate re-enactors, but realized his mistake when the company suddenly vanished from his sight.

A school field trip became quite an experience for some of the children one spring day. After the guided tour, they were invited to wander the area of the bloody battle for a short time before their departure. Later they reported to their teacher that they had heard what sounded like chanting - like fa-la-la-la-la of ‘Deck the Halls’. The teacher, who was a Civil War buff, knew -but the children could not possibly have -that the war cry of the Irish Sixty-Ninth New York militia, which fought among the Union troops, was Faugh A Ballach, which in English is ‘Clear the Way!’ but in Gaelic is pronounced ‘Fah-ah-bah-lah’.

The nearby Burnside Bridge, named after Major General Ambrose E Burnside, who held the bridge for the Union, also is said to be haunted, as is a local bed-and-breakfast.

APANTOMANCY

A method of divination by taking cues from chance meetings with animals, birds and other creatures. The superstition associated with a black cat crossing one’s path is apantomancy.

APPARITION

The supernatural appearance of a person, animal or object too far away to be seen, felt or heard by normal senses. Contrary to popular belief, most apparitions are of the living not the dead, but apparitions of the dead are also called ghosts.

Only a small number of apparitions are visual; most apparition experiences feature noises, unusual smells, extreme cold or heat and the displacement of objects.

Every civilization throughout history and around the world has held beliefs about apparitions. Among Asian peoples belief in ancestral ghosts is strong, and rituals exist to honour and placate them, as the spirits of the dead are thought to interfere regularly in the affairs of the living and are credited for both good and bad fortune. The ancient Hebrews, Greeks and Romans believed that spirits of the dead could return to haunt the living.

During the Dark Ages people believed in all manner of apparitions: demons, vampires and devil dogs. Around this time the Christian Church taught that ghosts were souls trapped in purgatory until they expiated their sins. The only apparitions that were holy and permitted by God were apparitions of religious figures, such as angels, saints and Jesus. All other apparitions, including spirits of the dead, were delusions created by Satan to confuse the living.

In seventeenth-century Europe apparitions of the dead played an important role as advisors to the living. Belief in ghosts fell out of favour in the eighteenth century, returning in the nineteenth with spiritualism, which espouses survival after death and mediumistic contact with the dead. Many motifs of apparitions appear in the folklore of different cultures, such as the Flying Dutchman or the ankou.

According to a study of apparitions by American psychical researcher Hornell Hart, published in 1956, there is no significant difference between apparitions of the living and of the dead. Apparitions can move through solid matter and appear and disappear abruptly. They can cast shadows. Some are corporeal and lifelike in their movement and speech while others are luminous or limited in movement and speech. Apparitions are typically dressed in clothing of their time. The majority of apparitions are thought to manifest for a reason, for instance, to communicate a crisis or death, give a warning, offer comfort or convey important information. Some haunting apparitions appear in places where emotional traumas have taken place, such as murders or battles, but other hauntings seem to be aimless.

Systematic studies of apparitions began with the Society for Psychical Research, London, in the late nineteenth century. By the 1980s polls in the Unites States conducted by the University of Chicago’s National Opinion Research Council showed a dramatic increase - around 78 per cent - in reported apparitions, perhaps due in part to changing public attitudes towards acknowledging paranormal experiences.

Although many ghost investigators have their own categories, the following are the most typical types:

Crisis apparitions: usually images that appear in moments of crisis to communicate death or danger. They typically appear to a person who has close emotional ties to theagent(the person who is the source of the apparition).

Apparitions of the dead: manifestations of someone who has died, usually within a short time after death, to comfort a loved one or communicate important information.

Collective apparitions: manifestations of the living or dead that occur to multiple witnesses. Approximately one-third of reported apparitions are witnessed collectively.

Reciprocal apparitions: apparitions of the living in which both agent and thepercipient(the person who experiences the apparition), separated by a distance, experience apparitions of each other simultaneously.

Deathbed apparitions: visual images of divine beings, religious figures and dead loved ones that are reported by the dying in the last moments of life.

Apparitions in cases suggestive of reincarnation:cases when the deceased appears in adreamto a member of the family into which it will be reborn. Such dreams occur frequently among Native American tribes of the Northwest and in Turkey, Burma and Thailand.

A large number of theories have been put forward to explain apparitions, but none explain all the different types. Society for Psychical Research founders Edmund Gurney and Frederick Myers at first believed apparitions were mental hallucinations that had no physical reality either produced by telepathy from the dead to the living or projected out of the percipient’s mind in the form of an image. Gurney also believed that collective apparitions were a product of telepathy among the living, projected by the primary percipient to others around him or her. However, telepathy among the living does not explain why witnesses in collective sightings notice different details.

Myers, who believed strongly in survival after death, began to doubt the telepathic theory as early as 1885. In his landmark book Human Personality and Its Survival after Death (1903), he suggested that the apparitions consisted of a ‘phan-tasmogenic centre’, a locus of energies that could be perceived by the most psychically sensitive people. He conceived of a ‘subliminal consciousness‘ as the basis from which the consciousness springs and which survives the body after death. He theorized that the subliminal consciousness was receptive to extrasensory input and that apparitions appeared to psychically receptive people.

Other theories that have been advanced subsequently about apparitions suggest they are:

Idea patterns or etheric images produced by the subconscious mind of the living.

Astral or etheric bodies of the agents.