INGESTION OF MIXED DIETS. 



309 



hydrate ingestion, lactose, which is present in milk in considerable 

 amounts, was noted as having a positive effect upon the metabolism; 

 hence we probably have here a summation effect of the protein and 

 lactose. While the three experiments as a whole are not especially 

 satisfactory as duplicate experiments, they are uniform in indicating 

 a positive increment due to the ingestion of milk. 



RESPIRATION EXPERIMENT. 



Only one respiration experiment was made with milk, this being a 

 part of the later investigations in Boston. The universal respiration 

 apparatus was employed, with experimental periods of the usual 15- 

 minute length. The basal value was determined in several periods 

 immediately preceding the taking of the food. 



H. F. T., July 14, 1911. The amount of milk taken by this subject 

 was 500 grams, with a fuel value of 358 calories. This energy content 

 was somewhat less than that of the milk used in the calorimeter experi- 

 ments, although derived from the three nutrients in the same propor- 

 tions as in those experiments. The details of the experiment are 

 given in table 234. The maximum increase in metabolism, which 

 occurred inside of the first hour, was relatively slight, the heat pro- 

 duction rising from 0.91 to 1.01 calories per minute. The basal 

 value was reached in 3 hours. Although unaccompanied by respi- 

 ration experiments with other subjects or with the same subject, 

 the results of this experiment are of interest for comparison with 

 the data obtained in the calorimeter experiments with this common 

 food material. 



TABLE 234. H. F. T., July 14, 1911. Lying. (Values per minute.) 



Milk (whole): 



Amount, 500 grams; nitrogen, 2.64 grams; total energy, 381 cals. 



Fuel value, 358 cals.; from protein, 19 p. ct.; from fat, 52 p. ct.; from carbohydrates, 29 p. ct. 



'Subject had eaten 206 grams beefsteak at 12 midnight, July 13. 

 'Subject drank milk between lO'W" and 10 b 10 m a. m. 



