MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 291 



TABLE III. — Composition of materials not included in Tables I and II used in connection with digestion experiments. 



Composition of coffet infusion. — Coffee infusion was prepared by pouring- boiling water 

 over around coffee and straining the infusion thus obtained. The nitrogen was determined in 

 this infusion and found to amount to about 0.004 grams per liter — quantities too small to be taken 

 into account. The coffee infusion is therefore reckoned simply as so much water. 



STATISTICAL DETAILS OF METABOLISM EXPERIMENTS. 



The details of the methods of conducting the experiments and of computing the results, as 

 well as the statistical tables in which these results are presented, will be- advantageously given in 

 connection with the description of one of the experiments. For this purpose we select No. 12, 

 which is the first in consecutive order of those here described in detail. 



EXPERIMENT NO. 12 — WORK WITH ALCOHOL DIET. 



Subject. — E. O., laboratory assistant. 31 years of age and weighing, without clothing, about 

 71 kilograms (157 pounds). 



Occupation dm/ring experiment. — Work 8 hours a day upon a stationary bicycle belted to a 

 small dynamo, thus making an ergometer as described on page 237. The voltage was measured 

 and the current passed through resistance within the apparatus and thus transformed into heat 

 and measured with the heat given off by the subject. Previous calibration showed the amount 

 of work done in driving the bicycle. 



Duration. — Preliminary period 1 days, beginning with breakfast April 8, 1898, and experi- 

 ment proper 4 days, beginning at 7 a. m. April 12 and ending at 7 a. m. April 16. The subject 

 entered the respiration chamber on the evening of April 11 and thus spent 5 nights and 4 days 

 within the calorimeter. 



Diet. — Ordinary food furnishing 121 grams of protein and 3,379 calories of energy, and in 

 addition 72.4 grams of alcohol furnishing 512 calories of energy, making the total energy of the 

 diet 3.891 calories. The alcohol was added to a sweetened coffee infusion. It was taken in «i 

 doses, :'> with the meals and the other 3 between meals and just before retiring. The coffee 

 infusion was prepared in the usual manner, care being taken to keep that given to the subject 

 free from particles of coffee. To 690 grams of infusion were added 50 grams of sugar and so 

 grams of commercial ethyl alcohol containing ( .»0.63 per cent absolute alcohol. The 80 grams of 

 commercial alcohol thus contained 72.4 grams of absolute alcohol and 7.5 grams water. The 

 diet was practically the same during both the preliminary digestion experiment and the metab- 

 olism experiment proper. The kinds and amounts of different food materials taken at each meal 

 and the amounts of coffee infusion and water consumed at different' times during the day are 

 shown herewith. 



