INGESTION OF PROTEIN DIETS. 27 



basal value had been determined on the experimental day, but since the 

 experiment is made on much the same plan as those in other labora- 

 tories, it is included in this discussion. Disregarding the high values 

 obtained in the last period, the only conclusion which can be drawn 

 from these imperfect data is that there was a positive increment in the 

 metabolism for at least 3 hours as a result of ingestion of this amount 

 of beefsteak. 



BEEFSTEAK AND SMALL AMOUNTS OF OTHER FOOD MATERIALS. 



In addition to the calorimeter experiments in which beefsteak alone 

 was eaten, a number of experiments were made in which the diet 

 included small amounts of bread or potato chips. The fact that these 

 small quantities of other food materials were taken will not, however, 

 materially interfere with the use of the results for comparison with 

 those obtained when only beefsteak was given. Emphasis has already 

 been laid upon the fact that the beefsteak was by no means a pure pro- 

 tein material and contained a relatively large amount of fat, approxi- 

 mately 30 to 40 per cent of the fuel value in most of the experiments 

 previously discussed being derived from this substance. The chair 

 calorimeter in Boston was used in all of the experiments but one, the 

 exception being an experiment with beefsteak and potato chips in 

 which the bed calorimeter was used. 



BEEFSTEAK AND BREAD. 



Three calorimeter experiments with beefsteak and bread were made, 

 all with one subject. Approximately 200 to 250 grams of beefsteak 

 were taken with 24 to 50 grams of bread. The statistical data regard- 

 ing these experiments, not included in the tables or in the discussion, 

 are given in the following paragraphs : 



F. M. A/., 10 h 14 m a. m. to 3^1 4 m p. m., January 1 1 , 1910. 60.4 kilograms.- 

 Moved about considerably in first period and at end of period was swinging 

 back and forth in chair. Urinated 7 h 30 m a. m., 10 h 20 m a. m., 3 h 25 m p. m. 

 Body-temperature: 36.76, 36.71, 36.85, 36.86, 36.83, 36.99 C. 



F. M. M., 9 h 8 m a. m. to 2 h 28 m p. m., January 13, 1910. Nitrogen in 

 urine per hour 7 h 30 m a. m. to 12 h 57 m p. m., 0.86 gram. 



F. M. M., 9*24 m a. m. to 2*24 p. m., January 14, 1910 Subject in ner- 

 vous and depressed condition before entering apparatus from causes having 

 no connection with experiment. Nitrogen in urine per hour 7 h 40 m a. m. to 

 I h 36 m p. m., 0.74 gram; I h 36 m p. m. to 2 h 35 m p. m., 0.78 gram. 



DISCUSSION OF EXPERIMENTS. 



F. M. M., January 11, 1910. The results of the experiment on this 

 date are recorded in table 207. The food taken consisted of 246 grams 

 of beefsteak and 50 grams of bread, with a nitrogen content of 10.70 

 grams. But one collection of urine was made for the experimental 



