Book 1 — Chapter X
Arthur John Brock translation
Chapter X
Nutrition not a simple process. (1) Need of subsidiary organs for the various stages of alteration, e.g., of bread into blood, of that into bone, etc. (2) Need also of organs for excreting the non-utilizable portions of the food, e.g., much vegetable matter is superfluous. (3) Need of organs of a third kind, for distributing the pabulum through the body.