Metabolism Experiment No. 102. 



25 



Food. 



The total amounts of food eaten, together with estimated amounts of nutri- 

 ents and energy, are given in table 9 herewith. The diet furnished about 14.3 

 grams of nitrogen and about 1900 calories of energy. 



Table 9. Weight, total nutrients, and energy of food 

 Metabolism experiment No. 102. 



[Amounts consumed by the subject.] 



Kind of food. 



Apples 



Beef 



Butter 



Crackers (soda) . 

 Breakfast cereal 

 Ginger-snaps ... 



Milk 



Sugar 



Tea 



Total 



Weight. 



Grams. 



149.8 



100.0 

 16.9 

 47.2 



100.0 

 9.5 



886.1 

 25.0 



395.5 



1729.0 



Protein. 



Grams. 



0.22 

 as. 28 



0.18 



4.63 

 15.28 



0.49 

 33.05 



0.40 



87.53 



Fat. 



Grams. 

 0.4 

 2.8 

 13.7 

 4.3 

 1.4 

 0.9 

 39.1 



62.6 



Carbo- 

 hydrates. 



Grams. 

 20.3 



34.5 



71.6 



7.2 



46.4 



25.0 



1.3 



206.2 



Energy. 



Cals. 



80.9 

 217.7 

 125.7 

 211.7 

 400.2 



40.3 

 746.2 



99.0 

 6.0 



1925.7 



Urine. 



From 7 a. m., April 17, to 7 a. m., April 18, the urine was carefully collected. 

 There were 695.9 grams of urine, with a specific gravity of 1.030, and con- 

 taining, by analysis, 10.80 grams of nitrogen, and by combustion, 90 calories 

 of energy. No analyses of feces were made. 



Elimination of Water- Vapor and Carbon Dioxide. 



The water vaporized from the lungs and skin, the carbon dioxide exhaled, 

 and the oxygen absorbed, are recorded in table 10. 



The water vaporized in the chamber remained very constant from period 

 to period, being a little over 200 grams. A knowledge of the water thus vapor- 

 ized is of great value in estimating the amount of energy required to vaporize 

 this water, and supplies one of the factors for the calculation of the total heat 

 production. Here, as in experiment 101, no attempt has been made to designate 

 whether the water vaporized was from the bed clothing, skin, or lungs of the 

 subject, or from articles used in the chamber, the important point being that 

 a certain amount of water was vaporized and heat was required to vaporize 

 this water. The data regarding the residual amount of water-vapor permit the 

 computation of the relative humidity. 



The amount of carbon dioxide remaining inside the respiration chamber at 

 the end of each period is recorded, as well as the total carbon dioxide elim- 

 inated. There are the usual slight fluctuations in these residual amounts. 

 The total carbon-dioxide production is not far from 200 grams per period, 

 although during sleeping hours it dropped to about 140 grams. The excessive 

 elimination from 7 a. m. to 1 p. m. may be accounted for by the extra work 

 involved in the weighings made by the subject immediately after getting up 

 in the morning. 



