




DIGEHSTIBILITY OF CEREAL BREAKFAST FOODS. 185 
The milk used in the experiments was from a mixture of the 
total product of several cows of a local herd, milk from the 
same cows being included each day. Previous experience had 
shown that the milk thus obtained was quite uniform in com- 
position from day to day. 
The cream used was that obtained by use of a separator from 
the mixed milk from a considerable number of cows. 
The sugar was granulated cane sugar obtained from a local 
grocer. 
Sampling of food.—The subjects of the digestion experiments 
ate together in the laboratory, taking three meals daily at the 
usualhours. Hach one weighed his own food just before eating. 
Before the experiments began, a quantity of the given breakfast 
food, more than sufficient for all the needs of the experiments, 
was thoroughly mixed, and from the mixed material a sample 
taken for analysis. ‘The rest was then kept in a large air tight 
receptacle, from which the subjects took the desired amount for 
each meal. In this way one analysis of a given breakfast food 
served for all the experiments with that particular food. 
Milk and cream were delivered at the laboratory in bottles, 
fresh each morning. As soon as the milk was delivered it was 
all poured into a large jar and thoroughly mixed, and from this 
an aliquot portion was then taken for a sample, the samples for 
all the days of an experiment being mixed together to forma 
composite sample for analysis. The cream was treated in the 
same manner. . Each of the subjects at meal time took his 
portion of milk or cream from the large jar, being careful to 
mix thoroughly each time, so as to distribute the fat evenly. 
' No sample was taken of the granulated sugar, since this 
material has been found so uniform in composition that analysis 
was deemed unnecessary. 
Separation of feces.—The success of a digestion experiment 
depends very largely upon the satisfactory separation of the 
feces of the experiment from those of the food immediately 
_ preceding and following. Separation was effected in these exper- 
iments by means of Jampblack in gelatin capsules, each subject 
_ taking one capsule with the first meal of each experiment, and 
another with the first meal succeeding each experiment. All 
the feces colored by the first capsule were included in the 
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