INGESTION OF MIXED DIETS. 311 



experiments being with crackers and milk and the other with cereal 

 and milk. In 8 experiments excessive amounts of food were taken, 

 either as breakfast or supper. In all but one of the calorimeter experi- 

 ments the measurements were made with the Middletown respiration 

 calorimeter. The experiment with H. L. H. was made with the bed 

 calorimeter in Boston. In the first four experiments discussed the 

 determinations were made in 24-hour periods. The basal values in all 

 cases were determined on some other than the experimental day. 



A. H. M., February 2-3, 1906. For the experiment with 70 grams 

 soda crackers, 50 grams graham wafers, and 1,030 grams whole milk, 

 a basal value was used which was obtained in November 1905. (See 

 table 22, page 70). The fuel value of the diet was 1,250 calories, of 

 which 15 per cent came from protein, 39 per cent from fat, and 46 per 

 cent from carbohydrates. The ingestion of this food in three portions 

 during the day resulted in an increment of 149 grams in carbon-dioxide 

 production, 80 grams in oxygen consumption, and 239 calories in heat 

 production. The doubtful expediency of employing a basal value so 

 far removed from the values obtained in the food experiment has 

 already been discussed in our previous consideration of these results 

 and need not be further emphasized. The main point to be noted here 

 is the fact that the crackers-and-milk diet resulted in an increment of 

 approximately 14 per cent in the heat production. 



D. W,, January 12-14, 1906. The subject took 166 grams of a dry 

 cereal and 450 grams of whole milk each day in three portions. (See 

 table 13, page 62). This diet had a fuel value of 943 calories, of which 

 14 per cent came from protein, 20 per cent from fat, and 66 per cent 

 from carbohydrates. The basal value used was determined in a fasting 

 experiment of two days preceding the food experiment. On the first 

 food day there was only a slight increment over the basal average 

 value, the metabolism being essentially the same as that on the last 

 day of the fast. On the second day with food there was a considerable 

 increment in the metabolism, which amounted for the heat production 

 to 184 calories. Here again we must call attention to the previous 

 discussion as to the errors involved in the used of a base-line of this 

 character. It is clear, however, that the ingestion of the food arrested 

 the fall in the metabolism incidental to fasting and finally produced 

 a rise. 



H. R. D., December 7-8, 1905. The diet consisted of 125 grams 

 orange juice, 1,427 grams milk, 181 grams of a dry cereal, 128 grams 

 eggs, and 149 grams apples. This amount of food was taken in three 

 portions at the ordinary meal times. (See table 11, page 61). The 

 basal value used for comparison was determined in a 2-day fast imme- 

 diately preceding the food day. The fuel value of the diet was 2,086 

 calories, of which 16 per cent came from protein, 35 per cent from fat, 

 and 49 per cent from carbohydrates. The ingestion of this amount of 



