CHAPTER XVII. WHAT PART OF THE BODY IS FIRST FORMED IN THE WOMB.
The Stoics believe that the whole is formed at the same time. Aristotle, as the keel of a ship is first made, so the first part that is formed is the loins. Alcmaeon, the head, for that is the commanding and the principal part of the body. The physicians, the heart, in which are the veins and arteries. Some think the great toe is first formed; others affirm the navel.
CHAPTER XVIII. WHENCE IS IT THAT INFANTS BORN IN THE SEVENTH MONTH ARE BORN ALIVE.
Empedocles says, that when the human race took first its original from the earth, the sun was so slow in its motion that then one day in its length was equal to ten months, as now they are; in process of time one day became as long as seven months are; and there is the reason that those infants which are born at the end of seven months or ten months are born alive, the course of nature so disposing that the infant shall be brought to maturity in one day after that night in which it is begotten. Timaeus says, that we count not ten months but nine, by reason that we reckon the first conception from the stoppage of the menstruas; and so it may generally pass for seven months when really there are not seven; for it sometimes occurs that even after conception a woman is purged to some extent. Polybus, Diocles, and the Empirics, acknowledge that the eighth month gives a vital birth to the infant, though the life of it is more faint and languid; many therefore we see born in that month die out of mere weakness. Though we see many born in that month arrive at the state of man, yet (they affirm) if children be born in that month, none wish to rear them.
Aristotle and Hippocrates, that if the womb is full in seven months, then the child falls from the mother and is born alive, but if it falls from her but is not nourished, the navel being weak on account of the weight of the infant, then it doth not thrive; but if the infant continues nine months in the womb, and then comes forth from the woman, it is entire and perfect. Polybus, that a hundred and eighty-two days and a half suffice for the bringing forth of a living child; that is, six months, in which space of time the sun moves from one tropic to the other; and this is called seven months, for the days which are over plus in the sixth are accounted to give the seventh month. Those children which are born in the eighth month cannot live, for, the infant then falling from the womb, the navel, which is the cause of nourishment, is thereby too much wrenched; and is the reason that the infant languishes and hath an atrophy. The astrologers, that eight months are enemies to every birth, seven are friends and kind to it. The signs of the zodiac are then enemies, when they fall upon those stars which are lords of houses; whatever infant is then born will have a life short and unfortunate. Those signs of the zodiac which are malevolent and injurious to generation are those pairs of which the final is reckoned the eighth from the first, as the first and the eighth, the second and the ninth, etc; so is the Ram unsociable with Scorpio, the Bull with Sagittarius, the Twins with the Goat, the Crab with Aquarius, the Lion with Pisces, the Virgin with the Ram. Upon this reason those infants that are born in the seventh or tenth months are like to live, but those in the eighth month will die.
CHAPTER XIX. OF THE GENERATION OF ANIMALS, HOW ANIMALS ARE BEGOTTEN, AND WHETHER THEY ARE OBNOXIOUS TO CORRUPTION.
Those philosophers who entertain the opinion that the world had an original do likewise assert that all animals are generated and corruptible. The followers of Epicurus, who gives an eternity to the world, affirm the generation of animals ariseth from the various permutation of parts mutually among themselves, for they are parts of this world. With them Anaxagoras and Euripides concur:
Nothing dies,
Different changes give their various forms.
Anaximander's opinion is, that the first animals were generated in moisture, and were enclosed in bark on which thorns grew; but in process of time they came upon dry land, and this thorny bark with which they were covered being broken, they lived only for a short space of time. Empedocles says, that the first generation of animals and plants was by no means completed, for the parts were disjoined and would not admit of a union; the second preparation and for their being generated was when their parts were united and appeared in the form of images; the third preparation for generation was when their parts mutually amongst themselves gave a being to one another; the fourth, when there was no longer a mixture of like elements (as earth and water), but a union of animals among themselves,—in some the nourishment being made dense, in others female beauty provoking a desire of spermatic motion. All sorts of animals are discriminated by their proper temperament and constitution; some are carried by a proper appetite and inclination to water, some, which partake of a more fiery quality, to live in the air those that are heavier incline to the earth; but those animals whose parts are of a just temperament are fitted equally for all places.
CHAPTER XX. HOW MANY SPECIES OF ANIMALS THERE ARE, AND WHETHER ALL ANIMALS HAVE THE ENDOWMENTS OF SENSE AND REASON.
There is a certain treatise of Aristotle, in which animals are distributed into four kinds, terrestrial, aqueous, fowl, and heavenly; and he calls the stars and the world too animals, yea, and God himself he posits to be an animal gifted with reason and immortal. Democritus and Epicurus consider all animals rational which have their residence in the heavens. Anaxagoras says that animals have only that reason which is operative, but not that which is passive, which is justly styled the interpreter of the mind, and is like the mind itself. Pythagoras and Plato, that the souls of all those who are styled brutes are rational; but by the evil constitution of their bodies, and because they have a want of a discoursive faculty, they do not conduct themselves rationally. This is manifested in apes and dogs, which have inarticulate voice but not speech. Diogenes, that this sort of animals are partakers of intelligence and air, but by reason of the density in some parts of them, and by the superfluity of moisture in others, they neither enjoy understanding nor sense; but they are affected as madmen are, the commanding rational part being defectuous and injured.
CHAPTER XXI. WHAT TIME IS REQUIRED TO SHAPE THE PARTS OF ANIMALS IN THE WOMB.
Empedocles believes, that the joints of men begin to be formed from the thirty-sixth day, and their shape is completed in the nine and fortieth. Asclepiades, that male embryos, by reason of a greater natural heat, have their joints begun to be formed in the twenty-sixth day,—many even sooner,—and that they are completed in all their parts on the fiftieth day; the parts of the females are articulated in two months, but by the defect of heat are not consummated till the fourth; but the members of brutes are completed at various times, according to the commixture of the elements of which they consist.