198 Mr. Chenevix's Observations on the 
(which I found to be 10090, like that of the other,) or in its 
chemical nature. 
M. Fourcroy mentions a phosphate, as contained in these 
humours ; but I could not perceive any precipitation by muriate 
or nitrate of lime ; nor did the alkalis denote the presence of 
any earth, notwithstanding M. Fourcroy’s assertion of that 
fact. 
HUMAN EYE. 
I could not procure a sufficient quantity of these, fresh enough 
to multiply my experiments upon them. However, by the 
assistance of Mr. Carpue, Surgeon to his Majesty’s Forces, I 
fully convinced myself, that the humours of the human eye, 
chemically considered, did not contain any thing different from 
the respective humours of the eyes I had examined. The 
aqueous and vitreous humours contained water, albumen, gela- 
tine, and muriate of soda; and the crystalline humour contained 
only water, albumen, and gelatine. The specific gravity of the 
aqueous and vitreous humours, I found to be 10053; while that 
of the crystalline was 107 go. 
EYES OF OXEN. 
I found the eyes of oxen to contain the same substances as 
the respective humours of other eyes. The specific gravity of 
the aqueous and vitreous humours is 10088; and that of the 
crystalline 10765. 
What is particularly worthy of notice is, that the difference 
which appears to exist between the specific gravity of the aqueous 
or vitreous humour and that of the crystalline, is much greater 
in the human eye than in that of sheep, and less in the eye of 
the ox. Hence it would appear, that the difference between the 
density of the aqueous and vitreous humour and that of the crys- 
