1042 PEPSIN, HEMATOSIN, GLOBULIN, ETC. 



similar, proving that they contain the same principle. Deduct- 

 ing the ashes, as usual, the results of one analysis of each 

 were : 



Hair. Horn. Nail. Wool. 



Carbon. . 50.652 51.540 51.089 50.653 



Hydrogen. . 6.769 6.799 6.824 7.029 



Nitrogen. . 17.936 17-284 16.901 17-710 



Oxygen. .1 24>643 ^^ 25.1S6 



oulphur. . J 



24.608 

 100.000 100.000 100.000 100.000 



M. Scherer constructs the following formula to express the 

 results of these analyses, and to exhibit the relation in composi- 

 tion of this class of substances to protein; compact horny 

 matter, C 48 H 39 N 7 O 17 . This contains the elements of protein 

 plus, 1 atom of ammonia and 3 atoms of oxygen. 



Horn, hair, wool and other horny substances dissolve in the 

 solution of caustic alkali, with disengagement of ammonia, and 

 the formation of some acetic acid. When the alkaline solution is 

 neutralised by acetic acid, effervescence occurs from the escape 

 of sulphuretted hydrogen, and a substance falls, soluble in an 

 excess of acetic acid, which possesses the properties and compo- 

 sition of protein. When the solution is precipitated by succes- 

 sive additions of acetic acid, the last additions give a yellowish 

 white precipitate, which is different from the first. 



Analyses of the protein from hair and of the other substance, 

 gave the following results : 



Protein from hair. Other substance from hair. 



Carbon. . . 55.150 53.516 



Hydrogen. . . 7.197 7-168 



Nitrogen. v S 15.727 14.801 



Oxygen. . . 21.9^6 24.515 



100.000 100.000 



From the composition of the latter, it is supposed to be the 

 same as the enveloping membrane of the albumen and inner 

 coat of the lining membrane of the egg. 



Feathers. The material of feathers has hitherto been sup- 



