816 EXPERIMENT STATION RECORD. 



to be used for the oxidation of starch. The excess of carbon dioxid 

 must be attributed to the formation of fat from starch. These facts are 

 more clearly brought out in the following equation: 



100 gm. fat will yield 950 calories. 

 100 gm. starcli will yield 418 calories. 



The greatest possible quantity of fat which can he formed from 100 gm. starch is 

 44, since 418-^-9.50=44. 



100 gm. starch contains 44.44 gm. C, 6.18 gm. H, 49.38 gm. O 



44 gm. fat contains 33.68 gm. C,5.28gm. H, 5.04 gm. O 



Difference 10.76 gm. C,0.90gm. H, 44.34 gm. O 



For oxidation there is required 28.69 gm. O + 7.20 gm. 0=33.89 gm. O. 

 The oxidation products are: 39.45 gm. C0 2 and 8.10 gm. EL> O. 

 Excess: 8.45 gm. O. (44.34—35.89=8.45.) 



This quantity of oxygen is available for the oxidation of further quan- 

 tities of starch. It would oxidize 7 13 gm. starch (162-4-192x8.45 = 

 7.13). This would yield 29.8 calories (7.13x4.18=29.8) and 11.62 gm. 

 carbon dioxid. That is, from 107.13 gm. starch 44 gm. fat can be pro- 

 duced, together with 51.7 gm. or 26 liters carbon dioxid and 29.8 calo- 

 ries. In other words, when the respiratory quotient is greater than 1, 

 each liter of carbon dioxid in excess of tlie quantity of oxygen required 

 is equivalent to 1.694 gm. fat and 1.15 calories. 



[Concluded in next number.] 



