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MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



The preliminary digestion experiment began with breakfast March 12, 1900. and continued 

 4 days. The diet during this period consisted of the basal ration supplemented by cane sugar. 

 as in experiment No. 29. 



The subject entered the respiration chamber on the evening of March 15, and experiment 

 No. 29 began at 7 a. m. March 16. and continued 3 days. During this experiment the diet 

 consisted of the basal ration supplemented by 128 grams of cane sugar furnishing 507 calories 

 of energy per day, as in the preliminary digestion period; the whole diet furnishing daily 100 

 grams of protein and 3.487 calories of energy. The daily amount of sugar in the form of rock 

 candy was supplied to the subject each morning at breakfast, and he ate it at intervals during 

 the day according to his taste. 



Experiment No. 30 began at 7 a. m. March 19. immediately at the close of experiment 29. 

 The diet in this experiment consisted of the basal ration supplemented by 79.5 grams of com- 

 mercial alcohol containing 90.6 per cent or 72 grams of pure ethyl alcohol in place of the sugar 

 of experiment No. 29. The alcohol supplied 509 calories of energy, and the whole ration in this 

 experiment furnished 99 grams of protein and 3, -158 calories of energy per day. The commer- 

 cial alcohol used in this experiment was added each day to 795.5 grams of water sweetened 

 with 25 grains of sugar from the basal ration. The total mixture, 900 grams, was divided into 

 6 portions which were taken with meals and between meals, as in other alcohol experiments. 



Experiment No. 31 began at 7 a. m. on the morning of March 22, and continued 3 days. 

 The diet in this experiment consisted of the basal ration supplemented by 63.5 grams of butter 

 in place of the alcohol in the previous experiment. The butter furnished nearly 1 gram of 

 protein and 511 calories of energy, so that the whole ration furnished 101 grams of protein 

 and 3,495 calories of energy per day. The butter was consumed at meals with the rest of 

 the diet. 



The following table summarizes the results of these 3 experiments. Detailed data of experi- 

 ment No. 30 will be found in the Appendix, pages 354 to 366, and those of experiments Nos. 29 

 and 31 will be found in Bulletin 109 of the Office of Experiment Stations. 



Table 6. — Summary of results of metabolism i vperiments Nos. "', SI, and ••'". 

 [Quantities per day.] 



