420 ANIMAL BODY. 



in the albumen. In order to separate them I evaporate to 

 dryness, pulverize the white residue, and boil it, first with ether 

 in order to separate fat, and then with spirit of -915 as long as 

 anything continues to be taken up. The albumen rapidly sinks 

 from the hot, clear, spirituous solution, and the supernatant fluid 

 which must be decanted from the sediment, soon begins to be- 

 come turbid from the separation of numerous flocculi of crys- 

 tallin. I evaporate to a slight residue, and then precipitate the 

 crystallin by strong,alcohol, in which it is only slightly soluble. 

 The lactates and chloride of sodium remain dissolved in the 

 alcohol. In this manner I analysed the crystalline lens of the 

 ox and the horse. 



Anal. 158. Anal. 159. 



Crystalline lens of ox. Ditto of horse. 



Water .... 65-762 60-000 



Albumen .... 23-290 25-531 



Crystallin .... 10-480 14-200 



Fat .... 0-045 '0-142 

 Extractive matter with chloride of T 



sodium and lactates . .} ' 495 



Berzelius has not separated the albumen and crystallin ; in 

 other respects his analysis approximates to mine, as far as the 

 amount of the protein- compounds is concerned. 

 He found it composed of: 



Water . . . 58-0 



Protein-compounds . . 35-9 



Alcohol-extract with salts . . 2-4 



Water-extract with traces of salts . 1-3 

 Cell-membrane . . .2-4 



It has been shown by Wurzer and Lassaigne, that when the 

 lens is opaque (in cases of cataract) it contains an excess of 

 phosphate of lime. This may be the cause of the opacity, or it 

 may be due to the coagulation of the protein-compounds by the 

 presence of a free acid. Wurzer determined the composition 

 of an opaque lens from a bear. It contained (after the removal 

 of the water) : 



Phosphate of lime . . . 68-9 



Carbonate of lime . . . 12-6 



Carbonate of magnesia . . . 3-6 



Peroxides of iron and manganese . .0-7 



Mucus (?) . . . .7-5 



Phosphate of lime with an animal matter . 2-1 

 Chloride of sodium with animal matter . 3-2 



Solid fat 1-1 



