126 DIFFERENCES IN COMPOSITION 



Composition of organic tissues. 



Albumen C^N^Ou + P + S* 



Fibrine C 48 N 6 H3 e O,4 + P + 2S 



Caseine C^H^Ou + S 



Gelatinous tissues, tendons ... C 48 N 7 . 5 H 4 iOi 3 



Chondrine C^NeH^Oao 



Hair, horn C^N^A; 



Arterial membrane C 48 N 6 H 38 O 16 



The composition of these formulae shews, that 

 when proteine passes into chondrine (the substance 

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

 with 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, C 48 N 6 

 HseOu 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 + 2HO 



Chondrine Pr + 4HO + 2O. 



Hair.horn Pr -f NH 3 + 3O. 



Gelatinous tissues ... 2Pr + 3NH 3 + HO + 7O. 



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. 



