The phenomena observed during the experiment may be summarized as a slight reduction of total food consumed, a large reduction of the protein element, especially of flesh foods, a lessened excretion of nitrogen, a reduction in the odor, putrefaction, fermentation and quantity of the feces, a slight loss of weight, a slight loss of strength, an enormous increase of physical endurance, a slight increase in mental quickness. These phenomena varied somewhat with different individuals, the variations corresponding in general to the varying degree in which the men adhered to the rules of the experiment. That we are correct in ascribing the results, especially in endurance, to dietetic causes alone, cannot reasonably be doubted when it is considered that no other factors of known significance were allowed to aid in this result. While the results of the present experiment lean toward "vegetarianism," they are only incidentally related to its propaganda. Meat was by no means excluded; on the contrary, the subjects were urged to eat it if their appetite distinctly preferred it to other foods. The sudden and complete exclusion of meat is not always desirable, unless more skill and knowledge in food matters are employed than most persons possess. On the contrary, disaster has repeatedly overtaken many who have made this attempt. Pavlov has shown that meat is one of the most and perhaps the most "peptogenic" of foods. Whether the stimulus it gives to the stomach is natural, or in the nature of an improper goad or whip, certain it is that some stomachs which are accustomed to this daily whip have failed, for a time at least, to act when it was withdrawn. Nor is it necessary that meat should be permanently abjured, even when it ceases to become a daily necessity. The safer course, at least, is to indulge the craving whenever one is "meat hungry," even if, as in many cases, this be not oftener than once in several months. The rule of selection employed in the experiment was merely to _give the benefit of the doubt_ to the non-flesh food; but even a _slight_ preference for flesh foods was to be followed. _REFERENCES_ Adami, J. G.: _Autointoxication and Sub-Infection_, British Medical Journal, January 24, 1914, p. 177; Jour. A. M. A., XII, No. 9, p. 701. Benedict, F. G., and Carpenter, Thorne M.: _The Metabolism and Energy Transformation of Healthy Man During Rest_, Carnegie Institution of Washington, D. C., 1910. Benedict, F. G.: _The Nutritive Requirements of the Body_, Amer. Jour. of Physiology, 1906, XVI, pp. 409-437. Benedict, F. G.: _The Factors Affecting Normal Basal Metabolism_, Proc. Nat. Acad. Sc., 1915, I, p. 105. Benedict, F. G., and Smith, H. M.: _The Influences of Athletic Training upon Basal Metabolism_, Proc. Nat. Acad. Sc., 1915, I, p. 102. Benedict, F. G., and Emmes, L. E.: _A Comparison of the Basal Metabolism of Normal Men and Women_, Proc. Nat. Acad. Sc., 1915, I, p. 104.