First, however, we must have more definite information as to what the real necessities of the body for proteid food are, and this information can be obtained only by careful scientific experimentation under varying conditions. This has been the object of the present study, and the results obtained are now placed before the public with the hope that they will prove not only of scientific interest and value, but that they will also serve to arouse an interest in the minds of thoughtful people in a subject which is surely of primary importance for the welfare of mankind. That the physical condition of the body exercises an all-powerful influence upon the mental state, and that a man’s moral nature even is influenced by his bodily condition are equally certain; hence, the subject of nutrition, when once it is fully understood and its precepts obeyed, bids fair to exert a beneficial influence not only upon bodily conditions, but likewise upon the welfare of mankind in many other directions. In presenting the results of the experiments, herein described, the writer has refrained from entering into lengthy discussions, preferring to allow the results mainly to speak for themselves. They are certainly sufficiently convincing and need no superabundance of words to give them value; indeed, such merit as the book possesses is to be found in the large number of consecutive results, which admit of no contradiction and need no argument to enhance their value. The results presented are scientific facts, and the conclusions they justify are self-evident. CONTENTS Page ACKNOWLEDGMENTS v PREFACE vii INTRODUCTORY 1 I. EXPERIMENTS WITH PROFESSIONAL MEN. Chittenden: Daily Record of Nitrogen Excretion, etc. 24 First Nitrogen Balance, with comparison of income and output, amount and character of the daily food 34 Second Nitrogen Balance, with composition of daily food, etc. 43 Mendel: Daily Record of Nitrogen Excretion, etc. 53 First Nitrogen Balance, with comparison of income and output, amount and character of the daily food 60 Second Nitrogen Balance, with composition of daily food, etc. 67 Underhill: Daily Record of Nitrogen Excretion, etc. 79 First Nitrogen Balance, with comparison of income and output, composition of the daily food, etc. 87 Second Nitrogen Balance, with composition of daily food, etc. 93 Dean: Daily Record of Nitrogen Excretion, etc. 98