4 2 
SIR DAVID BREWSTER ON THE ANATOMICAL AND OPTICAL 
Deer, Iloe. 
Indian. 
Moose. 
Buffalo, Wild. 
Nilgao, India. 
Llama. 
Puma. 
Cheetah. 
Antelope, Melampus. 
Pygmy. 
Doer. 
Cat. 
Otter. 
Rat. 
Mouse. 
Opossum. 
Squirrel. 
Lemur, Black. 
Red-fronted. 
Nocturnal, 
Baboon. 
Monkey, Douroucouli. 
Black Spider. 
Entellus. 
Green. 
Lesser White-nosed. 
Jacketed. 
Vicugna. 
Capybara. 
Chinchilla. 
Ichneumon. 
Fish caught near the Azores. 
The fibres which 
Fox, Common. Coati, Brown. 
Black, from America. Suricate. 
1 . Lion. — The posterior surface of the lens is the most convex, 
compose the lens are exceedingly distinct, and the teeth smaller and sharper than 
those of fishes. 
2. Tiger. — The fibres and the teeth which unite them are very distinct, and like 
those of the lion. In a lens preserved in spirits, and deprived of its external lamina, 
the lamina shone with all the incommunicable colours of mother-of-pearl. When the 
lens was dried these colours disappeared. 
3. Hoi 'se. — When the lens of the horse is thrown for a second or two into boiling 
water, and is allowed to dry slowly, it splits in such a manner as to show the septa 
and the general structure of the lens very satisfactorily. The fibres are well seen, 
and the teeth distinct and small like those of the lion and the tiger. 
4. Llama, Puma, Capybara, &c. — The fibres and teeth are exceedingly distinct in 
the lenses of these animals, and equally or less so in all the other animals in the Table. 
5. Cat. — In order to observe if the fibrous structure was the same in the young 
animal, I took the eyes of three kittens, six in number, about eighteen hours after 
birth ; and what was very remarkable, I found that the lenses in all the six were 
white and opake, with a perfectly transparent rim. The three septa were distinctly 
seen in all the lenses. It will be interesting to ascertain, if in all animals which are 
born blind, the crystalline is opake at their birth, and gradually becomes transpa- 
rent from the margin to the centre during the period in which the eye is closed 
against the admission of light. 
(}. Chinchilla. — The lens of the chinchilla seems to fill the whole ball, and the cor- 
nea is exceedingly large, forming almost a hemisphere. 
7. Suricate. — The cornea of the suricate is nearly of the same size as that of the 
chinchilla. 
8. Unknown Fish from the Azores. — The lens of this fish, which was sent to me 
without a name by Mrs. Green of Cumberland Island, is in every way remarkable. 
It is the only lens of a fish which has the structure belonging to quadrupeds ;• and it 
is equally peculiar in having the form of a prolate spheroid, the axis of which coin- 
