

— 
EXPERIMENTS ON DIGESTION OF FOOD BY MEN. Tee 
Experiment No. 5.—Kind of food: Milk. Subject: The same as in the pre- 
ceding experiment. Weight (without clothing): 67.1 kilos (148 Ibs.), at the 
beginning, and 65.8 kilos (145 lbs.), at the end of the experiment. The experi- 
ment commenced with breakfast, December 19, 1896, and ended with supper, 
December 21, making 9 meals. The separation of the feces was made with 
milk and charcoal in the usual manner. 
Experiment No. 9.—Kind of food: Bread and sugar. Subject: Laboratory 
janitor as in the preceding experiments. Weight (without clothing): 67.6 kilos 
(149 lbs.). The experiment commenced with breakfast, September 16, 1895, 
and ended with supper, September 17, making 6 meals. The separation of the 
feces was made as above, but was not as well defined as usual. The milk and 
charcoal feces from the supper of September 15 appeared partly on September 
17 and the remainder September 18. Grape seeds from grapes eaten on the 
evening of September 14 were scattered through the milk and charcoal feces and 
a few were in the feces from the bread and sugar. To learn whether this lag in 
the passage of the grape seeds through the intestine was normal, grapes were 
eaten heartily for dinner, September 20, the seeds being swallowed. Supper 
consisted of milk and the following breakfast of bread. The grape seeds were 
scattered through the feces of the milk, of the bread and of the food next fol- 
lowing the bread. 
This experiment is practically a repetition of No. 3, except that in this 
instance the bread was analyzed, while in the former the flour from which the 
bread was made was analyzed. It will be observed that the amount of ether 
extract in the feces was larger than that in the bread, though the quantities in 
both were small. These results illustrate very forcefully the difficulty of accu- 
rate estimates of digestibility of fats by the current methods. 
Experiment No. 10.—Kind of food: Mixed diet. Sudzect: Same as in the 
preceding experiments. Weight (without clothing): 67.1 kilos (148 lbs.). The 
experiment commenced with breakfast, January 28, 1896, and ended with 
dinner, January 31, making eleven meals. This experiment, with what may be 
called a mixed diet, represents more nearly normal conditions in this respect 
than any of the previous ones. The results would seem on this account to be 
more trustworthy as representing the digestibility of the nutrients in an ordinary 
diet. Accordingly the data of this experiment are used with those of Nos. 6, 
II, 12, 13 and 14, which were also with mixed diet, for the computations of 
table 53, beyond. 
Experiment No, 11.—Kind of food: Mixed diet. Subject: The same as in 
the preceding experiment. Weight (without clothing): 66.9 kilos (147% lbs.). 
The experiment commenced with breakfast, February 15, 1896, and ended with 
dinner, February 19, making 14 meals, of which the last seven were taken in 
the respiration apparatus as respiration experiment No. 1, previously described. 
The cheese in the experiment was not burned in the bomb calorimeter, as the 
sample had decomposed before the combustion could be made. The heat of 
combustion was estimated from the values obtained from a similar cheese. The 
beef was round steak chopped fine in a meat cutter and mixed with a little 
onion and fried. The crackers were ordinary ‘‘ milk crackers.” The bread was 
made of rye and wheat flour and was such as the subject was accustomed to eat 
at home. 
