This is the work which the leaders of the new movement are engaged upon. To quote a single instance: while I was “living as I had been living” and eating the preparations of ignorant cooks in boarding-houses and restaurants, Dr. Kellogg of Battle Creek was bringing all the resources of modern chemistry and bacteriology to bear upon the problem of the nutrition of man; taking all the foods used by human beings, and analyzing them and testing them in elaborate experiments; determining the amount of their available nutriment and their actual effect upon the system in all stages of sickness and health; the various ways of preparing them and combining them, and the effect of these processes upon their palatability and ease of digestion. Every day for nine years, so Kellogg told me, he sat down to an experimental meal designed by himself and prepared by his wife; and the result is a new dietary—that in use at the Battle Creek Sanitarium—which awaits only the spread of knowledge to change the ways of eating of civilized man. This new health knowledge has been amassed by many workers and, as in all cases of new knowledge, there is much chaff with the grain. There are faddists as well as scientists; there are traders as well as humanitarians. It seemed to us that there was urgently needed a book which should gather this new knowledge, and present it in a form in which it could be used by the average man. There have been many books written upon this; but they are either the work of propagandists with one idea—containing, as we have proved to our cost, much dangerous error; or else the work of physicians and specialists, whose vocabulary is not easily to be comprehended by the average man or woman. What we have tried to write is a book which sets forth what has been proved by investigators in many and widely-scattered fields; which is simple, so that a person of ordinary intelligence can comprehend it; which is brief, so that a busy person may quickly get the gist of it; and which is practical, giving its information from the point of view of the man who wishes to apply these new ideas to his own case.