126 DIFFERENCES IN COMPOSITION 



Composition of organic tissues. 



Albumen C48N6H36O14 + P + S* 



Fibrine C^sNeHgeOH + P + 2S 



Caseine C48N6H36O14 + S 



Gelatinous tissues, tendons ... C43Nj..5H4iOig 



Chondrine C4sNgH4o02o 



Hair, horn C48N7H39O17 



Arterial membrane C48N6H38O16 



The composition of these formulae shews, that 

 when proteine passes into chondrine (the substance 

 of the cartilages of the ribs), the elements of water, 

 Avith oxygen, have been added to it ; while in the 

 formation of the serous membranes, nitrogen also 

 has entered into combination. 



If we represent the formula of proteine, C48N6 

 H360,4 by Pr, then nitrogen, hydrogen, and oxygen 

 have been added to it in the form of known com- 

 pounds, and in the following proportions, in form- 

 ing the gelatinous tissues, hair, horn, arterial mem- 

 brane, &c. 



Proteine. Ammonia. Water. Oxygen. 



Fibrine, Albumen Pr 



Arterial membrane ... Pr + 2H0 



Chondrine Pr + 4H0 + 20. 



Hair, horn Pr + NH3 +30. 



Gelatinous tissues ... 2Pr + 3NH3 + HO + 70. 



17. From this general statement it appears that 

 all the tissues of the body contain, for the same 



* The quantities of sulphur and phosphorus here expressed by 

 S and P are not equivalents, but only give the relative proportions 

 of these two elements to each other, as found by analysis. 



Jeji jV^f^f:^[Xj) off/^f 



