Q. Why are the lips moveable? A. For the purpose of forming the voice and words which cannot be perfectly done without them. For as without a, b, c, there is no writing, so without the lips no voice can well be formed.
Q. What causes men to yawn or gape? A. It proceeds from the thick fume and vapours that fill the jaws; by the expulsion of which is caused the stretching out and expansion of the jaws, and opening of the mouth.
Q. Why doth a man gape when he seeth another do the same? A. It proceeds from the imagination. And this is proved by the similitude of the ass, who by reason of his melancholy, doth retain his superfluity for a long
time, and would neither eat nor piss unless he should hear another doing the like.
Of the Teeth.
Q. Why do the teeth only, amongst all ether bones, experience the sense of feeling? A. That they may discern heat and cold, that hurt them, which other bones need not.
Q. Why have men more teeth than women? A. By reason of the abundance of heat and cold which is more in men than in women.
Q. Why do the teeth grow to the end of our life, and not the other bones? A. Because otherwise they would be consumed with chewing and grinding.
Q. Why do the teeth only come again when they fall, or be taken out, and other bones being taken away, grow no more? A. Because other bones are engendered of the humidity which is called radical, and so they breed in the womb of the mother, but the teeth are engendered of nutritive humidity, which is renewed and increased from day to day.