106 STORRS AGRICULTURAL EXPERIMENT STATION. 
included in a given group. The results here summarized are 
used on the following pages in the discussion of the problems 
mentioned on page 102. 3 
Norte.—During the interval between the first and the last of these experiments, 13. 
experiments were carried on under the auspices of the Committee of Fifty for the In- 
vestigation of the Drink Problem, in connection with an independent investigation 
concerning the effect of alcohol in the diet. For convenience in keeping the labora- 
tory records all experiments were numbered consecutively. These experiments in 
which alcohol formed a part of the diet comprised Nos, 7, 10, 12, 15-20, 22, 27, 30 and 33. 
The details of the first two were published in Bul. 69 of the Office of Experiment Sta- 
tions of the U. S. Department of Agriculture; those of the remaining eleven will soon 
be published elsewhere. 
FOOD MATERIALS SUPPLIED AND CONSUMED, AND THE DIFFER- 
ENCE IN DEMAND BY MEN AT REST AND AT WORK. 
One of the objects of these experiments is to accumulate in- 
formation regarding the demands of the body for food with 
different persons and under different conditions of rest and 
work. Data bearing upon this question are found in all of the 
metabolism experiments. In each case the ration was deter- 
mined, as far as practicable, by the diet to which the subject 
had been accustomed under similar conditions. ‘The details of 
the experiments* show the total amounts and composition of 
the food, drink, and excretory products, from which are deter- 
niined the actual income and outgo of material in the body and 
the gain or loss of protein and fat by the body, as set forth in 
Table 24.. In this table the results of experiments Nos. 1-4 
are included in addition to those summarized in Table 23. 
By ‘‘available food’’ is understood the total food less the 
feces; in other words, the sum of the nutrients which are avail- 
able to the body for the building of tissue and yielding energy. 
No correction is introduced for metabolic products in the feces, 
since these were derived originally from the food (or body 
tissue), and are a necessary accompaniment of undigested ma- 
terial. The available energy of the food is the total heat of 
combustion of the food minus the heat of combustion of the 
unoxidized materials of feces and urine. No further correc- 
tion for the labor of chewing and digesting is included. 
It is assumed that the quantity of carbohydrates in the body 
is the same at the beginning as at the end of the experiment. 
The gains and losses of protein and fat are computed from the 

* Published in the bulletins of the Office of Experiment Stations above referred to. 

