EYE 



taken from M. Cuvier's Anatomie Comparee, which shews the parts of 

 the axis lying in the several humours. 



The radii of the surfaces of the chrystalline are in 



Man as 12 to 16 



Dog 12 to 14 



Ox 6 to 21 



Rabbit 14 to 14 



Owl 16 to 14 



The specific gravities of the different parts are as folloxvs, that of 

 distilled water being 1. 



In the In the 

 0-jf. Cod Fish. 



Aqueous humour 1 1 



Vitreous humour 1.016 1.013 



Chrystalline lens (mean) 1.114 1.165 



Outer part of ditto , 1.070 1.140 



Inner 1.160 I 1.200 



As to their refractive powers, they must be more considerable than 

 their density indicates, on account of the inflammable particles which 

 enter into their composition. 



Dr. Wollaston makes the refracting power of the vitreous humour 

 equal to that of water, and that of the chry.stalliue lens of the ox jrroater 

 111 



