324 FOOD INGESTION AND ENERGY TRANSFORMATIONS. 



to 11, 1905, and January 28 to February 2, 1905. It so happens that 

 in the long fasting experiment of 7 days with S. A. B., the metabolism 

 was essentially constant on the first 4 days ; on the fifth day there was 

 a sudden fall of over 100 calories, followed by another fall of 100 

 calories on the sixth day. In the experiment with A. L. L., the varia- 

 tions in the metabolism are somewhat pronounced ; as a matter of fact 

 the value is the same on the fourth day as on the first. Certain varia- 

 tions in these values from day to day may be in part accounted for by 

 variations in muscular activity, although the attempt was made to 

 have like activity on all days. 



In the food experiment with A. L. L., the diet averaged 1,615 grams 

 of a modified milk and 6 grams of plasmon per day, the total daily 

 intake being 1 ,621 grams. This had a total fuel value of 2,502 calories, 

 of which 9 per cent came from protein, 79 per cent from fat, and 12 per 

 cent from carbohydrates. In the food experiment with S. A. B., 

 January 11 to 12, 1905, the food taken per day was 1,253 grams of a 

 modified milk and 106 grams of orange juice, the daily amount being 

 1,359 grams. The total fuel value was 1,698 calories, of which 9 per 

 cent came from protein, 73 per cent from fat, and 18 per cent from 

 carbohydrates. In the second food experiment with S. A. B. (February 

 2-5, 1905), the subject ate per day, 1,200 grams modified milk, 123 

 grams apples, 313 grams orange juice, and 35 grams graham crackers; 

 the daily total was 1,671 grams. The total fuel value was 2,078 calo- 

 ries, of which 8 per cent came from protein, 65 per cent from fat, and 

 27 per cent from carbohydrates. In the last food experiment with 

 S. A. B. (March 11-14, 1905), the food taken per day was 650 grams 

 modified milk, 123 grams apples, 178 grams whole wheat breakfast 

 food (dry), 10 grams gluten bread, and 313 grams orange juice, a daily 

 total of 1,274 grams. The total fuel value was 1 ,788 calories, of which 

 9 per cent came from protein, 37 per cent from fat, and 54 per cent from 

 carbohydrates. 



The amounts of food ingested were unfortunately not satisfactory, 

 the fuel value of the food intake being determined solely by the appe- 

 tite of the subject on the first day of food following the fast. The diet 

 for the subsequent days was the same as that on the first day, the 

 amounts varying only a few grams, if at all. The fuel value of the food 

 in the experiment with A. L. L. was considerably above the 24-hour 

 maintenance requirement. In the first experiment with S. A. B., it 

 was essentially that of maintenance, in the second experiment with this 

 subject it was measurably above maintenance, and in the third experi- 

 ment it was above the maintenance requirements during the fasting, 

 but practically the same as the need for maintenance during the food 

 period. 



We thus consider here an influence of food upon the fasting metabo- 

 lism which is not represented simply by the increment above a basal 



