CHONDRIN. 215 



Chondrin from the cornea of the eye was found composed of, 



100-000 



He represents it by the formula C 48 H 40 Az 6 O 20 . Calculating 

 from this we get, 



48 carbon, = 36 or per cent. 50-35 



40 hydrogen, = 5 ... 7 '00 



6 azote, =10-5 ... 24-68 



20 oxygen, =20 ... 27 -97 



71-5 100- 



These numbers agree pretty well with the analyses. In compar- 

 ing the formula of Scherer with that of Mulder we must leave 

 out the sulphur which Scherer did not attempt to estimate. If 

 we reduce Scherer's formula to that of Mulder it will be C 32 H 27 

 Az 4 O 13 , differing by an atom of hydrogen in excess and an atom 

 of oxygen deficient. If we adopt Scherer's formula, and compare 

 chondrin with protein we have, 



Chondrin, . C 48 H 40 Az 6 C 20 

 Protein, . C 48 H 36 Az 6 O 14 



H 4 O 6 , which may be 



represented by 4 (H O) -}- O 2 ; or two atoms of water and two 

 of oxygen. 



We cannot at present explain the cause of the different proper- 

 ties which collin and chondrin possess, though it must be connected 

 with the mode in which the elementary atoms are arranged in each. 

 There can be little doubt that chondrin as well as collin is an 

 amide ; but nothing is known respecting the acid, which may be 

 extracted from it, though it is probably the same as that from collin. 



It will now be proper to point out the different textures of the 

 animal body which yield colliri and chondrin respectively. The 

 subject has been examined with care by J. Miiller and Schwann. 



1. Skins give collin. 



2. Tendons give collin. 



3. The cornea of the eye gives chondrin. 



