
EXPERIMENTS ON DIGESTION OF FOOD BY MEN. 173 
Experiment No, 12,—Kind of food: Mixed diet. Subject: The same as in 
the preceding experiments. Weight (without clothing): 67.4 kilos (148% Ibs.). 
The experiment commenced with breakfast, February 24, 1896, and ended with 
dinner, February 28, making 14 meals, of which the last 7 were taken in the 
respiration calorimeter as respiration experiment No. 2, previously described. 
The meat was prepared as in experiment No. 11, and the diet was the same 
in kind, the chief difference being that only about half as much milk was taken 
in this experiment as in No. 11. 
Experiment No, 13.—Kind of food: Mixed diet. Subject: Chemist, 23 years 
old. Weight (without clothing): 63.6 kilos (140 lbs.). The experiment began 
with breakfast, March 13, 1896, and ended with breakfast, March 21, making 
25 meals, of which the last 15 were taken in the respiration calorimeter as 
respiration experiment No. 3. The meat was chopped and fried as in experi- 
ments II and 12, but without the addition of onions. 
Lxperiment No. 14.— Subject: Physicist, 22 years old. Weight (without 
clothing): 76.2 kilos (168 Ibs.). The experiment began with breakfast, March 
19, 1896, and ended with dinner, April 4, making 50 meals, of which the last 
36 were taken in the respiration calorimeter as respiration experiment No. 4. 
The meat was prepared as in the previous experiment by chopping finely with a 
meat chopper and then frying, the sample for analysis being taken at the same 
time. 
DIGESTION AND METABOLISM EXPERIMENT WITH THREE 
CHEMISTS. 
Experiment No. 6 was carried out in 1894 by Messrs. R. L. 
Slagle, Ph. D., H. Monmouth Smith and H. A. Torrey, chem- 
ists at that time engaged in nutrition investigations in this 
_laboratory. ‘The results so far as regards the consumption of 
food were published in the Report of the Station for 1894 
(p. 194) as dietary No. 20. The object, however, was not 
simply to make this a dietary study, but also a digestion 
experiment with determinations of the income and outgo of 
nitrogen. 
Inasmuch as: part of the results of this experiment were 
given in the Report of the Station for 1894, as above stated, 
only such details are cited here as are necessary to the under- 
standing of the investigation as an experiment upon the 
digestion of the food materials and the metabolism of nitrogen. 
The subjects were engaged in their ordinary duties about the laboratory, and 
in addition to the exercise belonging to their regular work they were accustomed 
to walk considerable distances after their day’s work was finished. 
In the conduct of the experiment special care was observed. The gentlemen 
boarded together and sat at the same table. By the kindness of the mistress of 
the house, who took a very intelligent interest in the investigation, arrange- 
ments were made by which the food of the three gentlemen during the period 
