308 



FOOD INGESTION AND ENERGY TRANSFORMATIONS. 



mental period of 8 hours, the total increment for carbon-dioxide pro- 

 duction was 20 grams, for oxygen consumption 6 grams, and for heat 

 production 59 calories. The only basal values available were those 

 determined 12 and 15 days subsequent to the food experiment. Never- 

 theless it is evident that the increment with this subject was materially 

 greater than with the subject of the preceding experiment. 



A. H. M., March 23, 1906. Following the ingestion of 599 grams 

 milk and 8 grams of lime-water, with a fuel value of 385 calories, an 

 increment was obtained in the carbon-dioxide production in the first 

 three periods, with a value below basal in the fourth period. (See 

 table 233.) The oxygen consumption was somewhat irregular and 

 also showed values below basal in the fourth period, with a total 

 increment of 11 grams for the 8 hours. The heat production in the 

 first three periods increased measurably, but here again a value below 

 the base-line was obtained in the last period. It is significant that in 

 the fourth period values below basal are observed for all of the three 



TABLE 233. A. H. M., March 23, 1906. Sitting. (2-hour periods.) 



Milk (whole): 



Amount, 599 grams; 1 nitrogen, 3.17 grams; total energy, 412 cals. 



Fuel value: Total, 385 cals.; from protein, 19 p. ct. ; from fat, 52 p. ct. ; from carbohydrates, 

 29 p. ct. 



Nitrogen in urine, 1.25 grams per 2 hours. 2 

 Basal values (February 12 and 14, 1906): CC>2, 45 grams; Oz, 40 grams; heat, 142 cals. 



'Also 8 grams lime-water. 



2 Sample included amount for about 2 hours without food preceding experiment. 



factors of metabolism, strongly implying that the basal value deter- 

 mined on February 12 and 14, 1906, was erroneous and that a true 

 basal value for this day would have been nearer to that found in this 

 period of the experiment. In that case the increment due to the inges- 

 tion of milk would have been greater than here recorded. It is clear 

 that even with this imperfect base-line there was a very measurable 

 increment due to the ingestion of milk, especially in the first three 

 periods. Since the total nitrogen intake was but 3.17 grams, it is 

 probable that this effect upon the metabolism should not be ascribed 

 solely to the protein in the milk. In our study of the effect of carbo- 



