68 



FOOD INGESTION AND ENERGY TRANSFORMATIONS. 



the oxygen consumption, and 80 calories for the heat production. 

 Since all of the factors were distinctly higher than those found on 

 either of the two fasting days, it is reasonable to suppose that the in- 

 creases found represent a positive increment. It is possible that some 

 of this increase may have been due to more activity on the food day in 

 connection with receiving the food, eating it, returning the dishes, 

 increased water drinking, and to defecation. 1 



TABLE 20. A. H. M., December 6, 1906. Sitting. (2-hour periods.) 

 Mayonnaise, lettuce, and lemon: 



Amount, 213 grams; nitrogen, 0.37 gram; energy, 1,112 calories. 



Fuel value: Total, 1,109 calories; from protein, 1 per cent; from fat, 98 per cent; 



from carbohydrates, 1 per cent. 

 Basal value (Dec. 3 and 4, 1906), CO 2 , 52 gms.; O 2 , 47 gms.; heat, 164 cals. 



finished eating mayonnaise, lettuce, and lemon 48 minutes after beginning of this period. 



Finally, to subdivide this particular experiment still further, the 

 results obtained for the first four 2-hour periods with food ?'. e., from 

 9 a. m. to 5 p. m. are given in table 20; the basal values used are the 

 average of those for the same period of time on the fasting days, and 

 are given in table 21. On this basis it will be seen that there was a 

 positive increase of 15 grams in the carbon-dioxide production in the 

 four 2-hour periods following the ingestion of the oil, 29 grams in the 

 oxygen consumption, and 69 calories in the heat production. 



Special attention is given here to the presentation of the results of 

 this particular experiment on account of the rather remarkable con- 

 tention of Gigon 2 that, according to his experience, the ingestion of oil 

 measurably depresses the metabolism. It is perhaps important to 

 note that Gigon gave perfectly pure olive oil, while the oil in our experi- 

 ment was mixed with a small proportion of lemon juice, egg yolk, and 

 lettuce. While the two series of experiments are not perfectly compar- 

 able, nevertheless it is of significance that the depression noted by 

 Gigon is at variance with the increment, slight though it is, shown in 

 our results. 



J See statistics for fasting and food d;iys, Dec. 5-6, 1906, on p. 251. 

 'Gigon, Arch. f. d. ges. Physiol., 1911, 140, p. 509. 



