314 



FOOD INGESTION AND ENERGY TRANSFORMATIONS. 



calories in the heat production. As the basal value for the heat pro- 

 duction was approximately 600 calories for the 8 hours of the experi- 

 ment, it will be seen that this increment of 162 calories corresponded 

 to an increase in the metabolism of 27 per cent. There was no indi- 

 cation that the stimulus to the metabolism had ceased at the end of 

 the experiment, as even in the last 2-hour period there was an increase 

 of 7 grams in the carbon-dioxide production, 8 grams in the oxygen 

 consumption, and 26 calories in the heat production. It is evident that 

 this excessive amount of food, although not so large as it was hoped the 

 subj ect could eat, produced a prolonged increase in the basal metabolism. 



TABLE 238. A. L. L., February 13, 1906. Sitting. (2-hour periods.) 



Heavy breakfast (mixed diet): 



Amount, 1,365 grams; nitrogen, 10.91 grams; total energy, 2,797 cals. 



Fuel value: Total, 2,720 cals.; from protein, 10 p. ct. ; from fat, 52 p. ct. ; from carbohydrates, 



38 p. ct. 

 Basal valves (February 7 to 20, 1906): CO2, 47 grams; Oz, 41 grams; heat, 151 cals. 



Subject ate food in about 30 minutes. 



A. L. L., February 15, 1906. Less food was taken in this experiment 

 than in the experiment on February 13 with the same subject. The 

 food eaten was 180 grams bread, 78 grams sugar, 323 grams oatmeal, 

 200 grams cream, 55 grams butter, 262 grams cocoa, and 98 grams eggs, 

 a total of 1,196 grams. The fuel value of this diet was 2,142 calories, 

 of which 9 per cent was derived from protein, 47 per cent from fat, 

 and 44 per cent from carbohydrates. The results of the experiment 

 are given in table 239. The carbon-dioxide increment continued for 

 the entire experimental period, with a total increment of 49 grams. 

 The oxygen consumption apparently reached its basal value in the 

 third period, with a total increment for the experiment of 20 grams. 

 The total increment in heat production was 96 calories, but the increase 

 was but 5 calories in the last period. The total increase in heat pro- 

 duction was approximately 16 per cent. 



A. H. M., February 16,1906. The second subject used for this series 

 of experiments was able to take much larger amounts of food than 

 A. L. L. On this date he ate for his breakfast 72 grams potato chips, 

 148 grams peanut butter, 222 grams bananas, 319 grams oatmeal, 



