Looking upon the human body from the physical point of view as the most perfect, most ingeniously economical, and most beautiful of living machines, the author has attempted to write a little handbook of practical instruction for the running of it. And seeing that, like other machines, it derives the whole of its energy from its fuel, the subject of foods--their properties, uses, and methods of preparation--has been gone into with unusual care. An adequate supply of clean-burning food-fuel for the human engine is so absolutely fundamental both for health and for efficiency--we are so literally what we have eaten--that to be well fed is in very fact two-thirds of the battle of life from a physiological point of view.