INGESTION OF PROTEIN DIETS. 



297 



considerably above the basal value even at the end of the experiment. 

 In three of the four experiments the nitrogen excretion in the urine 

 was the highest in the third 2-hour period of the experiment. There 

 was a distinct tendency, however, for the greatest increase in the heat 

 output to occur in the first 4 hours of the experiment. 



PLASMON AND SKIM MILK. 



The glidine used in the protein experiments represented an approxi- 

 mately pure vegetable protein; the gluten was also a vegetable protein. 

 To study the effect of an animal protein, plasmon, a food material 

 derived from milk, was given to the subject in two experiments. Bo 

 experiments were made with the Middletown respiration calorimet 

 in 2-hour periods. 



H. R. D., May 4, 1906. In addition to 100 grams of plasmon, the 

 subject took 70 grams of plasmon milk biscuit and 206 grams of skim 

 milk. The total nitrogen intake was 15.07 grams, of which 11.92 

 grams came from the plasmon, 2.10 grams from the plasmon milk 

 biscuit, and 1.05 grams from the skim milk. With this diet 36 per cent 

 of the fuel value of the intake was derived from carbohydrates and 

 but 54 per cent from protein. The basal value employed was the aver- 

 age of determinations made between February 6 and April 20 of the 

 same year. As may be seen from table 228, an increment in carbon- 

 dioxide excretion was found in all four periods. The measurement of 

 oxygen consumption was not obtained for the first period, but subse- 

 quently a pronounced increment was observed. The heat pioduction 

 also increased in the four periods and the nitrogen excretion was very 



TABLE 22S.H. R. D., May 4, 1906. Sitting. (2-hour periods.) 

 J'lasmon, plasmon milk biscuit, and skim milk: 



Amounts, 100 grams plasmon, 70 grams plasmon milk biscuit, 206 grams skim milk; nitrogen, 



15.07 grams; total energy, 890 cals. 

 Fuel value: Total, 758 cals.; from protein, 54 p. ct.; from fat, 10 p. ct.; from carbohydrates, 



36 p. ct. 



Basal values (February 6 to April 20, 1906): COj, 47 grams; O?, 42 grams; heat, 146 cals. 

 Nitrogen in urine, 0.77 gram per 2 hours (May 4, 1906). 



^Subject ate food in 36 minutes. 



Increment of oxygen 2 to 8 hours after food. 



