598 



EXPERIMENT STATION RECORD. 



iiulicates tlie heat equivalent of the quantity of glycocol wliicli is pro- 

 duced by the splittino- up of 1 gra. of liippuric acid. 



(relatinokh. — In addition to the true albuminoids the heat equivalents 

 of a number of so-called gelatinoids liave been determined, with the 

 following results: 



Htat of cumhnstion and elemeniary conqxjsition of (jelatinoids, etc. 



Cleavage producU of proicUls. — In the following table are included 

 the most important derivatives produced in the metabolism of proteids 

 in the organism. 



Under the head of heat equivalent the table shows the value obtained 

 by the combustion of 1 gram molecule of the substance expressed in 

 large calories, and also the amount of heat obtained by the combustion 

 of 1 gm. of the substance expressed in small calories. For instance, 

 if 1 gram molecule or 75 gm. of glycocol yields by combustion CO2, 

 H2O, and N, a quantity of heat would be liberated snffitiient to raise 

 the temperature of 234.6 kg. of water (of about 17°) 1 degree, or where 1 

 gm. of glycocol burns to the same compounds sufficient heat is liber- 

 ated to raise the temperature of 3,128 gm. of water 1 degree. 



Derivalivcs of ihe j))'o(eid8. 



Substance. 



ComiiDsitioii. 



Molecular 



weiglits. 



Heat equivalent. 



Large 



calories 



per gram 



molecules. 



Small 

 calories 



per 

 gram. 



Glycocol 



Alanin 



Sarkosin 



Leucin 



Hippuric acid 



A spar tic acid 



TJrea 



Asparagin 



Kreatin (cry.stallized) 

 Kreatin (water- free). 



Uric acid 



Guanin 



Catfein 



C2H5NO2 



CHjKOj 



OsH^NO, 



CeH.sNOj 



CsHaNOs 



C4H,N04 



C Hj NO 



C4H8N,03 



C4H9 NaO.^.H./) . 



CjUgN^O-i 



C5H4N4O3 



C5H5N6O 



C8H,„N402 



75 



89 



89 



131 



179 



133 



60 



132 



149 



131 



168 



151 



194 



234. 6 

 387.7 

 401.1 

 855. 8 



1, 014. 5 

 385.2 

 1.52. 2 

 463. 5 

 553.3 

 560.0 

 460.5 

 586.6 



1, 014. 6 



3,128 

 4, 356 

 4,507 

 6, 533 

 5,678 

 2,896 



2, 537 



3, 511 

 3,713 

 4,275 

 2,741 

 3,885 

 5,230 



