Cicero's Tusculan Disputations

There is some cause to admire also the provision of nature in the case of those aquatic animals which are generated on land, such as crocodiles, river-tortoises, and a certain kind of serpents, which seek the water as soon as they are able to drag themselves along. We frequently put duck-eggs under hens, by which, as by their true mothers, the ducklings are at first hatched and nourished; but when they see the water, they forsake them and run to it, as to 303their natural abode: so strong is the impression of nature in animals for their own preservation.

XLIX. I have read that there is a bird called Platalea (the shoveller), that lives by watching those fowls which dive into the sea for their prey, and when they return with it, he squeezes their heads with his beak till they drop it, and then seizes on it himself. It is said likewise that he is in the habit of filling his stomach with shell-fish, and when they are digested by the heat which exists in the stomach, they cast them up, and then pick out what is proper nourishment. The sea-frogs, they say, are wont to cover themselves with sand, and moving near the water, the fishes strike at them, as at a bait, and are themselves taken and devoured by the frogs. Between the kite and the crow there is a kind of natural war, and wherever the one finds the eggs of the other, he breaks them.

But who is there who can avoid being struck with wonder at that which has been noticed by Aristotle, who has enriched us with so many valuable remarks? When the cranes224 pass the sea in search of warmer climes, they fly in the form of a triangle. By the first angle they repel the resisting air; on each side, their wings serve as oars to facilitate their flight; and the basis of their triangle is assisted by the wind in their stern. Those which are behind rest their necks and heads on those which precede; and as the leader has not the same relief, because he has none to lean upon, he at length flies behind that he may also rest, while one of those which have been eased succeeds him, and through the whole flight each regularly takes his turn.

I could produce many instances of this kind; but these may suffice. Let us now proceed to things more familiar to us. The care of beasts for their own preservation, their circumspection while feeding, and their manner of taking rest in their lairs, are generally known, but still they are greatly to be admired.

L. Dogs cure themselves by a vomit, the Egyptian ibis by a purge; from whence physicians have lately—I mean but few ages since—greatly improved their art. It is reported 304that panthers, which in barbarous countries are taken with poisoned flesh, have a certain remedy225 that preserves them from dying; and that in Crete, the wild goats, when they are wounded with poisoned arrows, seek for an herb called dittany, which, when they have tasted, the arrows (they say) drop from their bodies. It is said also that deer, before they fawn, purge themselves with a little herb called hartswort.226 Beasts, when they receive any hurt, or fear it, have recourse to their natural arms: the bull to his horns, the boar to his tusks, and the lion to his teeth. Some take to flight, others hide themselves; the cuttle-fish vomits227 blood; the cramp-fish benumbs; and there are many animals that, by their intolerable stink, oblige their pursuers to retire.

LI. But that the beauty of the world might be eternal, great care has been taken by the providence of the Gods to perpetuate the different kinds of animals, and vegetables, and trees, and all those things which sink deep into the earth, and are contained in it by their roots and trunks; in order to which every individual has within itself such fertile seed that many are generated from one; and in vegetables this seed is enclosed in the heart of their fruit, but in such abundance that men may plentifully feed on it, and the earth be always replanted.

With regard to animals, do we not see how aptly they are formed for the propagation of their species? Nature for this end created some males and some females. Their parts are perfectly framed for generation, and they have a wonderful propensity to copulation. When the seed has fallen on the matrix, it draws almost all the nourishment to itself, by which the fœtus is formed; but as soon as it is discharged from thence, if it is an animal that is nourished by milk, almost all the food of the mother turns into milk, and the animal, without any direction but by the pure instinct of nature, immediately hunts for the 305teat, and is there fed with plenty. What makes it evidently appear that there is nothing in this fortuitous, but the work of a wise and foreseeing nature, is, that those females which bring forth many young, as sows and bitches, have many teats, and those which bear a small number have but few. What tenderness do beasts show in preserving and raising up their young till they are able to defend themselves! They say, indeed, that fish, when they have spawned, leave their eggs; but the water easily supports them, and produces the young fry in abundance.

LII. It is said, likewise, that tortoises and crocodiles, when they have laid their eggs on the land, only cover them with earth, and then leave them, so that their young are hatched and brought up without assistance; but fowls and other birds seek for quiet places to lay in, where they build their nests in the softest manner, for the surest preservation of their eggs; which, when they have hatched, they defend from the cold by the warmth of their wings, or screen them from the sultry heat of the sun. When their young begin to be able to use their wings, they attend and instruct them; and then their cares are at an end.

Human art and industry are indeed necessary towards the preservation and improvement of certain animals and vegetables; for there are several of both kinds which would perish without that assistance. There are likewise innumerable facilities (being different in different places) supplied to man to aid him in his civilization, and in procuring abundantly what he requires. The Nile waters Egypt, and after having overflowed and covered it the whole summer, it retires, and leaves the fields softened and manured for the reception of seed. The Euphrates fertilizes Mesopotamia, into which, as we may say, it carries yearly new fields.228 The Indus, which is the largest of all rivers,229 not only improves and cultivates the ground, 306but sows it also; for it is said to carry with it a great quantity of grain. I could mention many other countries remarkable for something singular, and many fields, which are, in their own natures, exceedingly fertile.

LIII. But how bountiful is nature that has provided for us such an abundance of various and delicious food; and this varying with the different seasons, so that we may be constantly pleased with change, and satisfied with abundance! How seasonable and useful to man, to beasts, and even to vegetables, are the Etesian winds230 she has bestowed, which moderate intemperate heat, and render navigation more sure and speedy! Many things must be omitted on a subject so copious—and still a great deal must be said—for it is impossible to relate the great utility of rivers, the flux and reflux of the sea, the mountains clothed with grass and trees, the salt-pits remote from the sea-coasts, the earth replete with salutary medicines, or, in short, the innumerable designs of nature necessary for sustenance and the enjoyment of life. We must not forget the vicissitudes of day and night, ordained for the health of animated beings, giving them a time to labor and a time to rest. Thus, if we every way examine the universe, it is apparent, from the greatest reason, that the whole is admirably governed by a divine providence for the safety and preservation of all beings.

If it should be asked for whose sake this mighty fabric was raised, shall we say for trees and other vegetables, which, though destitute of sense, are supported by nature? That would be absurd. Is it for beasts? Nothing can be less probable than that the Gods should have taken such pains for beings void of speech and understanding. For whom, then, will any one presume to say that the world was made? Undoubtedly for reasonable beings; these are the Gods and men, who are certainly the most perfect of all beings, as nothing is equal to reason. It is therefore credible that the universe, and all things in it, were made for the Gods and for men.

But we may yet more easily comprehend that the Gods have taken great care of the interests and welfare of men, 307if we examine thoroughly into the structure of the body, and the form and perfection of human nature. There are three things absolutely necessary for the support of life—to eat, to drink, and to breathe. For these operations the mouth is most aptly framed, which, by the assistance of the nostrils, draws in the more air.

LIV. The teeth are there placed to divide and grind the food.231 The fore-teeth, being sharp and opposite to each other, cut it asunder, and the hind-teeth (called the grinders) chew it, in which office the tongue seems to assist. At the root of the tongue is the gullet, which receives whatever is swallowed: it touches the tonsils on each side, and terminates at the interior extremity of the palate. When, by the motions of the tongue, the food is forced into this passage, it descends, and those parts of the gullet which are below it are dilated, and those above are contracted. There is another passage, called by physicians the rough artery,232 which reaches to the lungs, for the entrance and return of the air we breathe; and as its orifice is joined to the roots of the tongue a little above the part to which the gullet is annexed, it is furnished with a sort of coverlid,233 lest, by the accidental falling of any food into it, the respiration should be stopped.

As the stomach, which is beneath the gullet, receives the meat and drink, so the lungs and the heart draw in the air from without. The stomach is wonderfully composed, consisting almost wholly of nerves; it abounds with membranes and fibres, and detains what it receives, whether solid or liquid, till it is altered and digested. It sometimes contracts, sometimes dilates. It blends and mixes the food together, so that it is easily concocted and digested by its force of heat, and by the animal spirits is distributed into the other parts of the body.

LV. As to the lungs, they are of a soft and spongy substance, which renders them the most commodious for respiration; 308they alternately dilate and contract to receive and return the air, that what is the chief animal sustenance may be always fresh. The juice,234 by which we are nourished, being separated from the rest of the food, passes the stomach and intestines to the liver, through open and direct passages, which lead from the mesentery to the gates of the liver (for so they call those vessels at the entrance of it). There are other passages from thence, through which the food has its course when it has passed the liver. When the bile, and those humors which proceed from the kidneys, are separated from the food, the remaining part turns to blood, and flows to those vessels at the entrance of the liver to which all the passages adjoin. The chyle, being conveyed from this place through them into the vessel called the hollow vein, is mixed together, and, being already digested and distilled, passes into the heart; and from the heart it is communicated through a great number of veins to every part of the body.

It is not difficult to describe how the gross remains are detruded by the motion of the intestines, which contract and dilate; but that must be declined, as too indelicate for discourse. Let us rather explain that other wonder of nature, the air, which is drawn into the lungs, receives heat both by that already in and by the coagitation of the lungs; one part is turned back by respiration, and the other is received into a place called the ventricle of the heart.235 There is another ventricle like it annexed to the heart, into which the blood flows from the liver through the hollow vein. Thus by one ventricle the blood is diffused to the extremities through the veins, and by the other the breath is communicated through the arteries; and there are such numbers of both dispersed through the whole body that they manifest a divine art.

Why need I speak of the bones, those supports of the body, whose joints are so wonderfully contrived for stability, and to render the limbs complete with regard to motion and to every action of the body? Or need I mention 309the nerves, by which the limbs are governed—their many interweavings, and their proceeding from the heart,236 from whence, like the veins and arteries, they have their origin, and are distributed through the whole corporeal frame?

LVI. To this skill of nature, and this care of providence, so diligent and so ingenious, many reflections may be added, which show what valuable things the Deity has bestowed on man. He has made us of a stature tall and upright, in order that we might behold the heavens, and so arrive at the knowledge of the Gods; for men are not simply to dwell here as inhabitants of the earth, but to be, as it were, spectators of the heavens and the stars, which is a privilege not granted to any other kind of animated beings. The senses, which are the interpreters and messengers of things, are placed in the head, as in a tower, and wonderfully situated for their proper uses; for the eyes, being in the highest part, have the office of sentinels, in discovering to us objects; and the ears are conveniently placed in a high part of the person, being appointed to receive sound, which naturally ascends. The nostrils have the like situation, because all scent likewise ascends; and they have, with great reason, a near vicinity to the mouth, because they assist us in judging of meat and drink. The taste, which is to distinguish the quality of what we take; is in that part of the mouth where nature has laid open a passage for what we eat and drink. But the touch is equally diffused through the whole body, that we may not receive any blows, or the too rigid attacks of cold and heat, without feeling them. And as in building the architect averts from the eyes and nose of the master those things which must necessarily be offensive, so has nature removed far from our senses what is of the same kind in the human body.

LVII. What artificer but nature, whose direction is incomparable, could have exhibited so much ingenuity in the formation of the senses? In the first place, she has covered and invested the eyes with the finest membranes, which she hath made transparent, that we may see through 310them, and firm in their texture, to preserve the eyes. She has made them slippery and movable, that they might avoid what would offend them, and easily direct the sight wherever they will. The actual organ of sight, which is called the pupil, is so small that it can easily shun whatever might be hurtful to it. The eyelids, which are their coverings, are soft and smooth, that they may not injure the eyes; and are made to shut at the apprehension of any accident, or to open at pleasure; and these movements nature has ordained to be made in an instant: they are fortified with a sort of palisade of hairs, to keep off what may be noxious to them when open, and to be a fence to their repose when sleep closes them, and allows them to rest as if they were wrapped up in a case. Besides, they are commodiously hidden and defended by eminences on every side; for on the upper part the eyebrows turn aside the perspiration which falls from the head and forehead; the cheeks beneath rise a little, so as to protect them on the lower side; and the nose is placed between them as a wall of separation.

The hearing is always open, for that is a sense of which we are in need even while we are sleeping; and the moment that any sound is admitted by it we are awakened even from sleep. It has a winding passage, lest anything should slip into it, as it might if it were straight and simple. Nature also hath taken the same precaution in making there a viscous humor, that if any little creatures should endeavor to creep in, they might stick in it as in bird-lime. The ears (by which we mean the outward part) are made prominent, to cover and preserve the hearing, lest the sound should be dissipated and escape before the sense is affected. Their entrances are hard and horny, and their form winding, because bodies of this kind better return and increase the sound. This appears in the harp, lute, or horn;237 and from all tortuous and enclosed places sounds are returned stronger.

The nostrils, in like manner, are ever open, because we have a continual use for them; and their entrances also are rather narrow, lest anything noxious should enter 311them; and they have always a humidity necessary for the repelling dust and many other extraneous bodies. The taste, having the mouth for an enclosure, is admirably situated, both in regard to the use we make of it and to its security.

LVIII. Besides, every human sense is much more exquisite than those of brutes; for our eyes, in those arts which come under their judgment, distinguish with great nicety; as in painting, sculpture, engraving, and in the gesture and motion of bodies. They understand the beauty, proportion, and, as I may so term it, the becomingness of colors and figures; they distinguish things of greater importance, even virtues and vices; they know whether a man is angry or calm, cheerful or sad, courageous or cowardly, bold or timorous.

The judgment of the ears is not less admirably and scientifically contrived with regard to vocal and instrumental music. They distinguish the variety of sounds, the measure, the stops, the different sorts of voices, the treble and the base, the soft and the harsh, the sharp and the flat, of which human ears only are capable to judge. There is likewise great judgment in the smell, the taste, and the touch; to indulge and gratify which senses more arts have been invented than I could wish: it is apparent to what excess we have arrived in the composition of our perfumes, the preparation of our food, and the enjoyment of corporeal pleasures.

LIX. Again, he who does not perceive the soul and mind of man, his reason, prudence, and discernment, to be the work of a divine providence, seems himself to be destitute of those faculties. While I am on this subject, Cotta, I wish I had your eloquence: how would you illustrate so fine a subject! You would show the great extent of the understanding; how we collect our ideas, and join those which follow to those which precede; establish principles, draw consequences, define things separately, and comprehend them with accuracy; from whence you demonstrate how great is the power of intelligence and knowledge, which is such that even God himself has no qualities more admirable. How valuable (though you Academics despise and even deny that we have it) is our 312knowledge of exterior objects, from the perception of the senses joined to the application of the mind; by which we see in what relation one thing stands to another, and by the aid of which we have invented those arts which are necessary for the support and pleasure of life. How charming is eloquence! How divine that mistress of the universe, as you call it! It teaches us what we were ignorant of, and makes us capable of teaching what we have learned. By this we exhort others; by this we persuade them; by this we comfort the afflicted; by this we deliver the affrighted from their fear; by this we moderate excessive joy; by this we assuage the passions of lust and anger. This it is which bound men by the chains of right and law, formed the bonds of civil society, and made us quit a wild and savage life.

And it will appear incredible, unless you carefully observe the facts, how complete the work of nature is in giving us the use of speech; for, first of all, there is an artery from the lungs to the bottom of the mouth, through which the voice, having its original principle in the mind, is transmitted. Then the tongue is placed in the mouth, bounded by the teeth. It softens and modulates the voice, which would otherwise be confusedly uttered; and, by pushing it to the teeth and other parts of the mouth, makes the sound distinct and articulate. We Stoics, therefore, compare the tongue to the bow of an instrument, the teeth to the strings, and the nostrils to the sounding-board.

LX. But how commodious are the hands which nature has given to man, and how beautifully do they minister to many arts! For, such is the flexibility of the joints, that our fingers are closed and opened without any difficulty. With their help, the hand is formed for painting, carving, and engraving; for playing on stringed instruments, and on the pipe. These are matters of pleasure. There are also works of necessity, such as tilling the ground, building houses, making cloth and habits, and working in brass and iron. It is the business of the mind to invent, the senses to perceive, and the hands to execute; so that if we have buildings, if we are clothed, if we live in safety, if we have cities, walls, habitations, and temples, it is to the hands we owe them.

313By our labor, that is, by our hands, variety and plenty of food are provided; for, without culture, many fruits, which serve either for present or future consumption, would not be produced; besides, we feed on flesh, fish, and fowl, catching some, and bringing up others. We subdue four-footed beasts for our carriage, whose speed and strength supply our slowness and inability. On some we put burdens, on others yokes. We convert the sagacity of the elephant and the quick scent of the dog to our own advantage. Out of the caverns of the earth we dig iron, a thing entirely necessary for the cultivation of the ground. We discover the hidden veins of copper, silver, and gold, advantageous for our use and beautiful as ornaments. We cut down trees, and use every kind of wild and cultivated timber, not only to make fire to warm us and dress our meat, but also for building, that we may have houses to defend us from the heat and cold. With timber likewise we build ships, which bring us from all parts every commodity of life. We are the only animals who, from our knowledge of navigation, can manage what nature has made the most violent—the sea and the winds. Thus we obtain from the ocean great numbers of profitable things. We are the absolute masters of what the earth produces. We enjoy the mountains and the plains. The rivers and the lakes are ours. We sow the seed, and plant the trees. We fertilize the earth by overflowing it. We stop, direct, and turn the rivers: in short, by our hands we endeavor, by our various operations in this world, to make, as it were, another nature.

LXI. But what shall I say of human reason? Has it not even entered the heavens? Man alone of all animals has observed the courses of the stars, their risings and settings. By man the day, the month, the year, is determined. He foresees the eclipses of the sun and moon, and foretells them to futurity, marking their greatness, duration, and precise time. >From the contemplation of these things the mind extracts the knowledge of the Gods—a knowledge which produces piety, with which is connected justice, and all the other virtues; from which arises a life of felicity, inferior to that of the Gods in no single particular, except in immortality, which is not absolutely necessary 314to happy living. In explaining these things, I think that I have sufficiently demonstrated the superiority of man to other animated beings; from whence we should infer that neither the form and position of his limbs nor that strength of mind and understanding could possibly be the effect of chance.

LXII. I am now to prove, by way of conclusion, that every thing in this world of use to us was made designedly for us.

First of all, the universe was made for the Gods and men, and all things therein were prepared and provided for our service. For the world is the common habitation or city of the Gods and men; for they are the only reasonable beings: they alone live by justice and law. As, therefore, it must be presumed the cities of Athens and Lacedæmon were built for the Athenians and Lacedæmonians, and as everything there is said to belong to those people, so everything in the universe may with propriety be said to belong to the Gods and men, and to them alone.

In the next place, though the revolutions of the sun, moon, and all the stars are necessary for the cohesion of the universe, yet may they be considered also as objects designed for the view and contemplation of man. There is no sight less apt to satiate the eye, none more beautiful, or more worthy to employ our reason and penetration. By measuring their courses we find the different seasons, their durations and vicissitudes, which, if they are known to men alone, we must believe were made only for their sake.