As Professor Jaffa states, the tentative dietary standard for a woman at light work calls for 90 grams of proteid daily, with a fuel value of 2500 calories. Both of these women were light in weight, and furthermore had no occasion to do much physical work; but even so, a daily consumption of only 0.8 gram and 0.52 gram of proteid, respectively, per kilo of body-weight, with the small calorific values indicated, represents a phenomenally small amount of food. And yet Jaffa, in referring to the woman with the lowest intake of food, states that even this small quantity of food, judging from the appearance and manner of the subject, “seemed sufficient for her needs, enabling her to do her customary housework and take care of her two nieces and nephew.” Regarding the children, it is stated that the commonly accepted American dietary standard for a child 13 years old and of an average activity calls for about 90 grams of proteid and 2450 calories. As is seen from the table, however, the 13-year-old girl consumed of proteid less than one-third, and of fuel value only about 60 per cent of the amount called for; yet, says Jaffa, “notwithstanding the facts brought out by this comparison, the subject had all the appearances of a well-fed child in excellent health and spirits.” We need not consume time in discussing the details of this experimental study, though the facts are interesting and suggestive, for it is only the general question of proteid requirement and calorific value that has interest for us at present. The fact is perfectly clear that this family of fruitarians, young and old, were quite able to live and thrive on a diet, the value of which in proteid and calories was at as low a level as was attained in our experimental studies. The rock of starvation, however, was not touched or even sighted by the voyagers down this stream of nutrition. We may all agree that it would be preferable, as a rule, to acquire the proteids, fats, and carbohydrates of our diet from a greater variety of sources than did the fruitarians; we might well complain at a dietary so limited in quality; but the point to be emphasized is that the low intake of proteid and the low fuel value were quite adequate for meeting the needs of the body. “It is a difficult matter,” says Professor Jaffa, “to draw any general conclusions from the foregoing dietaries without being unjust to the subjects. It would appear, upon examining the recorded data and comparing the results with commonly accepted standards, that all the subjects were decidedly undernourished, even making allowances for their light weight. But when we consider that the two adults have lived upon this diet for seven years, and think they are in better health and capable of more work than they ever were before, we hesitate to pronounce judgment. The three children, though below the average in height and weight, had the appearance of health and strength. They ran