266 FOOD INGESTION AND ENERGY TRANSFORMATIONS. 



jects on May 24 and 25, 1907, the amount of food used was about half 

 that taken in the earlier series; the metabolism measurements began 

 approximately 15 minutes after the eating of the beefsteak. In all of 

 these experiments the periods were 2 hours long. Statistical data 

 regarding the experiments, not included in the tables or the discussion, 

 are as follows: 



A, H. M., 9 h 29 m a. ra. to 5 h 29 m p. m., April 5, 1907. 65.9 kilograms. 

 Took enema without result; drank water 9 h 37 m a. m., Il h 34 m a. m., 12 h 13 rn 

 p. m., I h 32 m p. m. (total amount, 325 grams). Urinated 7 h 15 m , 9 h 35 m , Il h 31 m 

 a. m., I h 32 m , 3 h 30, 5 h 29 m p. m. ; slight desire to defecate in later periods. First 

 two periods very quiet, reading most of time; in last two periods somewhat 

 more active but still comparatively quiet; read but little in these periods. 

 Body-temperature: 36.87, 36.76, 36.70, 36.82, 36.85 C. Pulse rate, 64; 

 respiration rate, 18. Nitrogen in urine per 2 hours 7 h 15 m a. m. to 9 h 35 m a. m., 

 3.23 grams. 



A. W. W., 9 h 08 m a. m. to 5*08 m p. m., April 6, 1907. 58.8 kilograms. 

 Enema at 7 h 10 m a. m., feeling of heaviness and fullness after eating; drowsy 

 during first part of experiment; studied first three periods, translating with 

 use of vocabulary, with consequently more minor activity than usual; fourth 

 period very quiet; middle of experiment, also throughout last period, felt 

 warm and perspired. Drank water at beginning of every period (846 grams in 

 all) ; urinated 8 h 09 m a. m. and every period of experiment. Body-temperature: 

 36.77, 36.70, 36.69, 36.79, 36.79 C. Pulse rate, 66; respiration rate, 21. 



A. H. M., 9 h 34 m a. m. to 5 h %4 m p. m., May 24, 1907. 65.9 kilograms.- 

 Enema at 7 h 15 m a. m. without result. Quiet in experiment; read greater part 

 of time; idle last hour. Drank water before experiment (175 grams); at end 

 of first period (31 grams). Tired at end of experiment. Urinated 7 h 10 m and 

 Il h 30 m a. m., 3 h 30 m and 5 h 50 m p. m. Body-temperature: 36.40, 36.39, 

 36.40, 36.12, 36.30 C. Pulse rate, 63; respiration rate, 18. 



A. W. W., 8 h 17 m a. m. to 4 h 17 m p. m., May 25, 1907. 56.7 kilograms.- 

 Very quiet throughout experiment ; urinated 6 h 30 m a. m. and in each of three 

 last periods ; drank water at beginning of every period (787 grams in all) . 

 Pulse rate, 64; respiration rate, 19. 



DISCUSSION OF EXPERIMENTS. 



A. H. M., April 5, 1907. The subject consumed 777 grams of beef- 

 steak in 1^ hours; the nitrogen content of the food was 35.68 grams. 

 The basal values used for comparison were obtained from two experi- 

 ments made about a month previous to the experiment with beefsteak. 

 This man had been used for a large number of experiments and was 

 usually very quiet and satisfactory in every way. While there was not 

 complete muscular repose throughout the experiment, the subject sat 

 quietly in a chair, reading most of the time. The urine was collected 

 in periods of 2 hours for the purpose of obtaining an indication of the 

 course of the nitrogen excretion. 



The results of the experiment are given in table 198 and show a 

 striking increment in all the factors of metabolism. The carbon- 

 dioxide production increased 12 to 20 grams, the oxygen consumption 

 8 to 16 grains, and the heat production 29 to 41 calories. The res- 



