does in starvation. In the chapter on starvation is explained that during starvation an animal lives on ils Int. and protein and that its length of life depends on these. When there is no fat, protein may burn exclusively, therefore "the quantity of the protein metabolism in starvation depends on the amount of fat in the body." "The actual loss of body weigh!, is greater when protein is tho source of energy than when the energy is derived from fat," because it requires •"!." gm. of protein to

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... eld 20.4 calories of heat, while 2.8 gm. of fat will yield the same.