This work should commence with the conception of man, and should describe the nature of the womb, and how the child inhabits it, and in what stage it dwells there, and the manner of its quickening and feeding, and its growth, and what interval there is between one stage of growth and another, and what thing drives it forth from the body of the mother, and for what reason it sometimes emerges from the belly of its mother before the due time.
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But she puts into them the soul of the body, which forms them that is the soul of the mother which first constructs in the womb the form of the man and in due time awakens the soul that is to inhabit it.
I have found that, in the composition of the human body as compared with the bodies of animals, the organs of sense are duller and coarser. Thus, it is composed of less ingenious instruments, and of spaces less capacious for receiving the faculties of sense.
To compare the bone structure of the horse with that of the man you should show the man on tiptoe in representing the legs.
Then you shall make a discourse on the hands of each animal in order to show how they vary, as in the bear in which the ligaments ofthe tendons of the toes of the foot are connected over the neck of the foot.
That cause which moves the water through its springs against the natural course of its gravity is like that which moves the humours in all the shapes of animated bodies.
The frog retains life for some hours when the head the heart and all the intestines have been taken away. And if you prick the said cord it instantly twitches and dies.
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