This new work expresses the most advanced views on this important subject. It discusses in a concise way the processes of digestion and metabolism. The key-word of the book throughout is "energy"—its source and its conservation.

"It is remarkable for the fineness of its diction and for its clear presentation of the subject, relieved here and there by a quaintly humorous turn of phrase that is altogether delightful."—Colin C. Stewart, Ph. D., Dartmouth College.