228 



FOOD INGESTION AND ENERGY TRANSFORMATIONS. 



terminated before the effect had ceased. As the time at which the 

 maximum effect occurred agrees fairly well with that in the other 

 experiments, these short experiments are included in table 171. With 

 100 grams of sucrose the carbon-dioxide increments were exceptionally 

 large, ranging from 38 to 58 per cent, with an average of 47 per cent. 

 With the oxygen consumption, the maximum increment ranged from 

 15 per cent to 27 per cent with an average of 20 per cent. The maxi- 

 mum increase in heat production ranged from 19 to 31 per cent with an 

 average of 24 per cent. The highest increment occurred on the average 

 from 45 to 60 minutes after the ingestion of the sugar. 



TABLE 170. Maximum effect of ingestion of levulose on carbon dioxide, oxygen, and heat 



in respiration experiments. 



l Period from the time when subject finished eating to the end of the last observation, except 

 when the increment of heat ended earlier. See tables 140 to 14S for complete observations. 

 2 Sugar taken with juice of one lemon on this day. 

 3 Sugar taken with juice of one-half lemon on this day. 

 'Same value occurs 2{ to 2\ hours after food. 

 'In cereal coffee (about 300 c.c. solution). 



The experiments in which 75 grains of sugar were taken do not lend 

 themselves so easily for comparison as the 100-gram experiments, since 

 they were made with only two subjects. The maximum increase in 

 carbon-dioxide production ranged from 21 per cent to 35 per cent with 

 an average of 30 per cent, while that for oxygen consumption ranged 

 from 5 to 13 per cent with an average of 11 per cent. The maximum 

 increase in heat production ranged from 10 per cent to 18 per cent with 

 an average of 15 per cent. Comparing these values with the averages 



