Chapter XXIX.--Symmetry of the Body.
"And mark in this the work of the Designer, how He has inserted the bones like pillars, on which the flesh might be sustained and carried. Then, again, how an equal measure is preserved on either side, that is, the right and the left, so that foot answers to foot, hand to hand, and even finger to finger, so that each agrees in perfect equality with each; and also eye to eye, and ear to ear, which not only are suitable to and matched with each other, but also are formed fit for necessary uses. The hands, for instance, are so made as to be fit for work; the feet for walking; the eyes, protected with sentinel eyebrows, to serve the purpose of sight; the ears so formed for hearing, that, like a cymbal, they vibrate the sound of the word that falls upon them, and send it inward, and transmit it even in the understanding of the heart; whereas the tongue, striking against the teeth in speaking, performs the part of a fiddle-bow. The teeth also are formed, some for cutting and dividing the food, and handing it over to the inner ones; and these, in their turn, bruise and grind it like a mill, that it may be more conveniently digested when it is conveyed into the stomach; whence also they are called grinders.
Chapter XXX.--Breath and Blood.
"The nostrils also are made for the purpose of collecting, inspiring, and expiring air, that by the renewal of the breath, the natural heat which is in the heart may, by means of the lungs, be either warmed or cooled, as the occasion may require; while the lungs are made to abide in the breast, that by their softness they may soothe and cherish the vigour of the heart, in which the life seems to abide;--the life, I say, not the soul. And what shall I say of the substance of the blood, which, proceeding as a river from a fountain, and first borne along in one channel, and then spreading through innumerable veins, as through canals, irrigates the whole territory of the human body with vital streams, being supplied by the agency of the liver, which is placed in the right side, for effecting the digestion of food and turning it into blood? But in the left side is placed the spleen, which draws to itself, and in some way cleanses, the impurities of the blood.
Chapter XXXI.--The Intestines.
"What reason also is employed in the intestines, which are arranged in long circular windings, that they may gradually carry off the refuse of the food, so as neither to render places suddenly empty, and so as not to be hindered by the food that is taken afterwards! But they are made like a membrane, that the parts that are outside of them may gradually receive moisture, which if it were poured out suddenly would empty the internal parts; and not hindered by a thick skin, which would render the outside dry, and disturb the whole fabric of man with distressing thirst.
Chapter XXXII.--Generation.
"Moreover, the female form, and the cavity of the womb, most suitable for receiving, and cherishing, and vivifying the germ, who does not believe that it has been made as it is by reason and foresight?--because in that part alone of her body the female differs from the male, in which the foetus being placed, is kept and cherished. And again the male differs from the female only in that part of his body in which is the power of injecting seed and propagating mankind. And in this there is a great proof of providence, from the necessary difference of members; but more in this, where, under a likeness of form there is found to be diversity of use and variety of office. For males and females equally have teats, but only those of the female are filled with milk; that, as soon as they have brought forth, the infant may find nourishment suited to him. But if we see the members in man arranged with such method, that in all the rest there is seen to be similarity of form, and a difference only in those in which their use requires a difference, and we neither see anything superfluous nor anything wanting in man, nor in woman anything deficient or in excess, who will not, from all these things, acknowledge the operation of reason, and the wisdom of the Creator?