182 STORRS AGRICULTURAL EXPERIMENT STATION. 
undigested nutrients rejected in the feces. In digestion ex- 
periments with adults powdered charcoal can be taken at 
the beginning and at the end of the experimental period, as 
described above on page 166, and thus the exact amount of the 
feces which came from the food consumed during the experi- 
ment can be determined and collected for analysis. This 
method was impracticable in the present case, and it was 
assumed that the undigested residue from the food of a given 
day would be excreted in the feces of the following day. 
Inasmuch as for some time preceding each study the daily 
food consumed was practically identical in kind and amount 
with that consumed during the experiment, any error from 
this assumption would probably be slight. 
Composttion of the food.—The food and feces were analyzed, 
and the heats of combustion were determined by the bomb 
calorimeter. ‘The results are shown herewith. 
GABLES 4) 
Percentages of nutrients in the foods used in two digestion expert- 
ments with an infant, and in the feces, together with fuel 
values per gram as determined by the bomb calorimeter. 
















u 3 ae ni s ay 
Oo . I om aE 
Foop MATERIALS. cE 5 5 & ae 2 ae E. 
Zz Oy = 3.0'9 
ics Sa 
| % % % % G Calories 
Milk, Ist experiment, - | 4160 | 85.37! 4.38] 5.43] 4.00 .82 .969 
Milk, 2d experiment, - | 4162°1'86;20 | 9.049" 4.47 | 2.62 ay 7) .876 
Oatmeal gruel, - - | 2535 | 95.69 87 ie: 2.94 =a .188 
Sugar, - - ~ =| 2722 — fe — (100.00) — 3.987 
Feces, ‘Ist experiment,» = | 2519 |! §:14416.38 14.08 40.39| 24.01 | 5.915 
Feces, 2d experiment, - | 2534 | 4.95-1.18.50)] 7.03 | 37-85 | 31.67 | 4.935 

The results.—At the time of the first experiment the child 
was receiving milk alone. Oatmeal gruel and rice gruel had 
been given previously with the milk, but had for a time been 
discontinued. It was observed that in this expériment the 
milk was not thoroughly digested at all times; undigested 
curds frequently appeared in the feces. The child’s appetite 
was also variable, the amount of milk taken per day varying 
from 33 to 50 ounces (935 to 1420 grams). 

