MEMOIES OF THE NATIONAL ACADEMY OF SCIENCES. 



247 



calories of energy per day in the ordinary diel of experiment No. 11. In consideration of the 

 difficulties in planning and regulating the diet so us to furnish exactly a definite quantity of 

 protein or energy, the agreement of the two diets in regard to amount of protein per day is very 

 satisfactory. 



In order to obtain a palatable diet in experiment No. 12, considerably more fat was furnished 

 than in experiment No. 11. consequently the carbohydrates (sugars and starches) had to be reduced 

 more than would be required for their replacement by the amount of alcohol used. The fat was 

 increased by 30 grams, corresponding to about 285 calories of energy, and the carbohydrates 

 were decreased by 189 grams, corresponding to about 770 calories, in the place, of the materials 

 left out of the diet so grams of commercial alcohol, with '.mi. 5 per cent or 72.1 grams of pure 

 ethyl alcohol, furnishing 512 calories of energy, were given each day. In this way the energy 

 of the alcohol diet of experiment 12 was made to agree very satisfactorily with that of the 

 ordinary diet of experiment No. 11. 



The preliminary period of this experiment began with breakfast on April 8, 1898, and 

 continued 4 days, during which the subject took considerable exercise in addition to his regular 

 occupation. The diet during the preliminary period was the same as during the metabolism 

 experiment proper. The subject entered the chamber on the evening of April 11; metabolism 

 experiment No. 12 began at 7 a. m. April 12, and continued until 7 a. m. April 16. 



The following table summarizes the results of these 2 experiments. Detailed data of 

 experiment No. 12 will be found in the Appendix, pages 291 to 305; those of No. 11 in Bulletin 

 109 of the Office of Experiment Stations: 



Table 5. — Summary of remits of metabolism experiments Nos. 11 mid 12. 

 [Quantities per <lay.] 



GROUP E. EXPERIMENTS NOS. 29. 31. AND 30. WORK EXPERIMENTS WITH ORDINARY DIET AND 



WITH ALCOHOL DIET. 



The series of experiments forming this group was carried out in March, 1900. They were 

 made with the same subject. J. F. S.. as in Group C. and for the same purpose, namely, to study the 

 relative replacing power of isodynamic quantities of alcohol, sugar, and fat. During this series 

 the subject remained in the calorimeter 9 days and 10 nights without intermission, and each 

 experiment in the series continued 3 days and nights. The experiments in Croup E differ from 

 those in Group C, however, in that the subject worked for 8 hours each day upon the bicycle 

 ergometer. described on page 237. As in the previous series of experiments referred to, there was 

 a basal ration which was the same and a supplemental ration which was different in each of the 

 3 experiments. The basal ration was planned to furnish approximately the same amount of 

 protein as in the series in Group C, with the addition of about 1,000 calories of energy per day 

 in order to furnish the extra energy required for the performance of the external muscular work 

 and the general increase of bodily activity. It furnished about 100 grams of protein and from 

 2,949 to 2,981 calories of energy per day in the different experiments. 



