The human body exists in a state of perpetual, unceasing change. It is built up of varied matferials, some of which, indeed, as for example the mineral parts of bone, arc fixed and enduring ;but the majority and these the most vital and important brain, and nerve, and muscle, and gland, are delicate and unstable ;constantly wearing away and as constantly repaired. There is then ceaseless need for new matter to replace old and worn out matter as unceasingly removed. The body, however, requires materials for other important purposes; as fuel for combustion, in order to keep the temperature of the body at the necessary heat, and for the supply of force or energy for every movement and action and operation of organic life. There is, moreover, in young creatures a need of materials for another grand purpose in addition the structure and development of new parts. Now the animal body can make little use of raw materials of the primary elements in their simple form either for building or repair. Muscle, for example, consists largely of nitrogen, combined with caxho [H. .0.
(Typographical errors above are due to OCR software and don't occur in the book.)
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