33 ' 
objects. While in some cases it was necessary to perforate and 
extract the contents to prevent their shrinking, others, after 
steeping in benzole, might be mounted as dry objects. : 
The rest of the evening was spent in examining a large 
collection of eggs, &c., provided by Mr. WonFok, and in viewing 
some beautiful photographs of bird parasites’ eggs lent by Mr. 
Curteis, of Holborn. 
At a Special Meeting, held the same evening, it was resolved 
that a letter of invitation, similar to the one of last year, be sent 
to the British Association, inviting them to hold their Meeting for 
1871 at Brighton; such letter to be accompanied by a list of 
inducements of the same nature as sent last year; that Mr. 
Mayall be requested to present the letter of invitation, and to 
represent the Society before the Council of the British Association ; 
and that he be empowered to state that, in the event of the 
invitation being accepted, the Officers and Members of the Society 
would do all in their power to assist in carrying out the objects of 
the Association. 
August 11th.—On The Vertebrate and Invertebrate Eye compared by 
Dr, Hatiirax. 
Homology and analogy existed throughout the great divisions 
of the animal kingdom : homology signifying correspondence of | 
structural components; analogy, ccrrespondence of function or use. 
The fore-extremity — with the same components —is the 
arm in man, the leg in the race-horse, the wing’ in the bird, 
the fin in the fish, and the paddle in the seal,—all different 
expressions of uniformity of plan. 
oh 
The wing of the fly and bird had the same function ; 
but the former derived its structure from the external, 
the latter from the internal skeleton. 
The vertebrate and invertebrate eye, in like manner, pre- 
sented the same homology throughout. 
Taking the human eye as an example, in addition to our know- 
ledge of its anatomy, we have personal knowledge of its func- 
tions. In explaining its structure, it was mentioned that the retina, 
