TOPICS: A wide variety of foods quite consistent with temperance in diet. Safety of low proteid standards considered. Arguments based on the alleged effects of low proteid diet on high proteid animals. Experiments of Immanuel Munk with dogs. Experiments of Rosenheim. Experiments of Jägerroos. Comments on the above experiments. The experiments of Watson and Hunter on rats. The writer’s experiments with dogs. Details of the results obtained with six dogs. Comparison of the results with those of previous investigators. Effect of a purely vegetable diet on dogs. Different nutritive value of specific proteids considered. Possible influence of difference in chemical constitution of individual proteids. Effect of low proteid diet on the absorption and utilization of food materials in the intestine of dogs. General conclusions from the results of experiments with animals. Man is by choice an omnivorous creature; he reaches out ordinarily in all directions for as wide a variety of foods as his circumstances and surroundings will allow. He rightly cultivates a taste for foods that have individuality of flavor, and derives pleasure and satisfaction from the eating of delicacies that appeal to palate and to reason. All this he can do without becoming an epicure or a glutton, and without violation of physiological laws or disregard of the teachings of temperance. As a being endowed with reason and intelligence he is, however, necessarily mindful of the possible deleterious effect of undue quantities of food, as he is likewise mindful of the desirability of avoiding certain varieties of food which personal experience has taught him are fraught with possible danger. Care and prudence in diet are legitimate outcomes of a reasonable interest in the welfare of the body, upon which so largely depend the happiness and working power of the individual.