180 



FOOD INGESTION AND ENERGY TRANSFORMATIONS. 



results obtained are given in table 102. Practically the entire increment 

 in the carbon-dioxide production was found in the first hour. The 

 oxygen consumption showed almost no increase after the ingestion of 

 the carbohydrate; in fact, there was a total decrease of 5 grams. The 

 slight increase in the heat production in the first two periods was in 

 part compensated by an actual loss in the subsequent periods. It 

 would appear probable from these data that the basal value selected for 

 this experiment should not properly be used, especially in view of the 

 fact that it is an average of two values obtained some two months 

 before the experiment with sugar was made, i. e., on March 15 and 

 21, 1907. The specially significant points in connection with this 

 experiment are that the carbon-dioxide production increased in the 

 first hour and that nearly all of the respiratory quotients were some- 

 what high. The fact that two of these quotients were as high as 1.19 

 and 1.10 throws considerable doubt upon the accuracy of the measure- 

 ments of the oxygen consumption. 



The values for this experiment are presented chiefly as an illustra- 

 tion of the difficulty of studying problems of this kind when small 

 amounts of ingested material are used, an attempt is made to lower the 

 period of measurement to one hour with so large a calorimeter as that 

 used in Middletown, and an apparently defective basal value is selected 

 which was obtained several months previous to the experiment. 



TABLE 102. A. W. W., May 28, 1907. Sitting. (1-hour periods.) 



Sucrose: 



Amount, 80 grams; energy, 317 cals. ; from carbohydrates, 100 p. ct. 

 Basal values (March 15 and 21, 1907): CO.;, 25 grams; Oj, 21 grams; heat, 78 cals. 



F. M. M., January 31, 1910. In the first Boston experiment the 

 subject took 100 grams of sucrose and the juice of one lemon with a 

 total energy value of 408 calories. The data given in table 103 for 

 this experiment show an increase in the carbon-dioxide production for 

 the first three periods and a slight increase in the oxygen consumption 

 with measurable increase in heat production. Thus all three factors 



