260 



FOOD INGESTION AND ENERGY TRANSFORMATIONS. 



2-hour period (see table 192). The subject, who has always been con- 

 sidered very satisfactory, maintained approximately uniform muscular 

 activity throughout the entire experiment. We may consider, there- 

 fore, that the increment measured is clearly due to the fat diet and that 

 the ingestion of butter and potato chips in these proportions had a 

 decided positive effect upon the metabolism. 



TABLE 192. A. H. M., March 25, 1907. Sitting. (2-hour periods.) 



Butter and potato chips: 



Amounts, 243 grams butter, 211 grams potato chips; nitrogen, 2.24 grams; total energy, 



3,222 cals. 

 Fuel value: Total, 3,202 cals.; from protein, 2 p. ct. ; from fat, 85 p. ct. ; from carbohydrates, 



13 p. ct. 



Nitrogen in urine, 0.89 gram per 2 hours. 1 

 Basal values (March 6 and 9, 1907) : CO2, 51 grams; Oz, 46 grams; heat, 164 cals. 



'Sample included amount for about 1J hours preceding eating of food. 



2 Subject ate food in 37 minutes. 



3 Heat eliminated corrected for change in body-weight, but not for change in body- temperature 



A. H. M., May 15, 1907. This second experiment was made with 

 A. H. M. about 7 weeks later; the details are given in table 193. He 

 was able to take only about half as much butter as in the previous 

 experiment, with a proportionate amount of potato chips. The exact 

 amounts taken were 113 grams of butter and 105 grams of potato 

 chips. Even with this reduced amount of fat in the diet, there was a 

 positive increment in carbon-dioxide production and heat production 

 in the first two periods. The values obtained for oxygen consumption 

 were erratic, the total effect being 10 grams less than the basal value. 

 Since both carbon-dioxide production and heat production showed a 

 positive increment, it is reasonable to conclude that this diet had a 

 definite effect upon the metabolism. As the respiratory quotients were 

 much higher than would be expected with a fat diet, it is probable that 

 the determinations of the oxygen consumption were erroneous. 



A. W. W., April 25, 1907. The amount of butter eaten by this sub- 

 ject, 85 grams, was approximately the same as that taken by E. H. B., 

 but the amount of potato chips was smaller, as he used but 104 grams or 

 about the same amount as that taken by A. H. M. in his last experi- 

 ment. The details of the experiment are given in table 194. The 



