Relations between Factors of Metabolism. 



203 



Relations between the Various Factors of Metabolism, 

 relation of carbon dioxide eliminated to water vaporized. 



The relative ease with which carbon dioxide can be determined and the diffi- 

 culties attending the determination of water make it highly desirable to find 

 some relationship that may exist between the elimination of carbon dioxide and 

 the vaporization of water. This ratio has been deemed of sufficient importance 

 by some investigators to compute the values in a number of experiments. Since 

 the same factors influence to a greater or less degree the elimination of both 

 carbon dioxide and water-vapor, it is not unreasonable to expect that there may 

 be a fairly constant ratio which will prove of value in computing the water 

 elimination in an experiment where the carbon dioxide has actually been 

 determined. Accordingly, the relationship between the carbon dioxide elimi- 

 nated and the water vaporized under different conditions will next be considered. 



Table 82. Ratio of carbon dioxide eliminated to water vaporized during 



sleep, after rest. 



Subject. 



W. O. A... 



D. W 



J. C. W... 

 H. C. K.. 



H. F 



A. L. L... 



A. W. S... 



E. O 



N. M. P... 



B. F. D... 



Subject. 



(b) 



(a) 

 Average 

 carbon 



per hour. pei Doul * 



Average 

 water 



(c) 



Ratio 

 C0 2 : HoO. 



(b-i-a) 



C. R. Y.. 

 J. F. S... 

 A. H. M. 

 H. R. D.. 

 S. A. B.. 

 H. E. S.. 

 H. L. K.. 



Grains. 

 25.0 

 22.4 

 19.4 

 21.1 

 19.9 

 23.8 

 19.4 



Average 



23.0 



Grams. 

 44.5 

 30.9 



25.4 

 26.5 

 26.9 

 29.2 

 28.6 



100:178 

 138 

 131 

 126 

 135 

 123 

 147 



32.3 



100:140 



During sleep. In the periods of most nearly uniform rest, namely, during 

 sleep, we can compare with propriety the carbon-dioxide excretion with the 

 water vaporized. These have been given in the case of 17 subjects in table 82. 

 In order to make the figures more strictly comparable, only those values for 

 carbon dioxide and water-vapor are here included which were obtained simul- 

 taneously, consequently the values for carbon dioxide may in a few instances 

 appear somewhat at variance with the values given in other tables. A similar 

 statement holds true with regard to the water vaporized per hour. In the last 

 column is recorded the ratio of carbon dioxide to water, taking carbon dioxide 

 as 100. It is seen that invariably there is more water vaporized per hour than 

 carbon dioxide. This ratio may vary from 100 : 104 with the subject D. W., up 

 to 100 : 178 with the subject C. E. Y. In general, for every 100 grams of carbon 

 dioxide excreted there are 140 grams of water vaporized. 



During waking liours. A comparison of the carbon dioxide eliminated with 

 the water vaporized has been made with 55 subjects in table 83. In order to 

 make the comparison again a true one, the carbon dioxide produced and water 



