20 e Vr. Hosack's Observations on Vision. 
nothing in vain ; but that it is not of that indispensable im- 
nortance writers upon opties have taught us to believe, 
fourthly Mr. Young tells us, he has not yet had an op- 
portunity o’f examining the human crystalline ; and l grants 
eu .h. «' « >» <>* “■ - h “ h ,5 *: 
he attributes to the lens in quadrupeds cannot tak p 
I: L, of --I, Th, l«c which 1 b- 
,b. atcvementiond tta ° 
OX the sheep, the rabbit, and the fish, and in all the same 
lamented structure is observable ; even in the spherical lens 
of the fish these lamella; are equally distinct, but wit iou 
smallest appearance of a muscle. conclusion. 
From these circumstances I cannot avoic , , 
that they do not exist ; at the same time .1 am persuaded 
Mr. Young met with appearances which he supposed -ere 
muscles • but I am satisfied he will readily acknowledge, that 
“ —i- .r «>»■»« 'r;r f c” 
State is not only attended with much difficulty, but 
— ^ r 
I apprehend may, probabl), 
'^Upon examining it after boiling, or exposing it to a gradual 
degree of heat before the fire, when it may be h«dkd 
freedom he will readily observe (without a glass) the num 
“elite, and the arrangement of their fibres, which 1 
'"lotheropinion has been sanctioned by many respecUble 
£^2234 ** figure’ of the crystalline, rendering 
