THE FASTING METABOLISM. 85 
Per Hour and Kg. Live Weight. 
tena ‘of Fasting, Caden wie Respiratory 
i larbon . 
Oxygen Consumed, wzere iss! e Quotient. 
0 1202.19 1111.80 0.93 
1468 1154.53 923.75 0.80 
2950 1146.76 811.12 0.71 
0 1250.28 
1575 1226.18 
3543 1241.78 
5940 1192.50 
334 1959.45 1494 .68 0.76 
1712 1850 .02 1318.19 0.71 
3233 1809.85 1289.63 0.71 
body, while as the experiment progressed the store of carbohydrates 
(glycogen) in the body was gradually exhausted and the meta- 
bolism finally became a fat metabolism. Since, now, as will be 
shown in Chapter VIII, the consumption of equal amounts of oxygen 
results in the liberation of approximately equal amounts of energy 
whether that oxygen is employed to oxidize carbohydrates or fats, 
Finkeler concludes that the total metabolism, as measured in terms 
of energy, was nearly constant. 
Lehmann and Zuntz* have observed a similar constancy of 
the respiratory exchange per unit of weight in the case of two 
men fasting for eleven and six days respectively, while Munk ft 
found their urinary nitrogen to be also approximately constant. 
Magnus-Levy { has likewise observed a similar constancy in the 
respiratory exchange of the dog and of man during fasting, as have 
also Johansson, Landgren, Sondén, & Tigerstedt § for man. 
Rubner,|| as a preliminary to his investigations upon the re- 
placement values of the nutrients, discusses this question at some 
length and gives the results of experiments upon dogs, rabbits, 
guinea-pigs and fowls, in which the excretion of nitrogen and car- 
bon per unit weight shows a marked degree of constancy through 
considerable periods. 
* Virchow’s Archiv, 131, Supp. t Arch. ges. Physiol., 55, 1. 
+ Ibid. §Skand. Archiv. f. Physiol., 7, 29. 
|| Zeit. f. Biol., 17, 214; 19, 313; Biologische Gesetze, p. 15. 
