Analyses of the Chrysoberyls from Haddam and Brazil. 11] 
tated from it. The matter precipitated by the subcarbonate 
of ammonia consisted of 3.68 grammes of alumina, or 73. 
60 per 100., and 0.19 grammes of peroxide of iron, which, 
on account of the colour of the mineral, must be estimat- 
ed as protoxide. The 0.19 grammes of peroxide are 
equivalent to 0.169 of protoxide, or 3.38 per 100. 
THE CONSTITUENTS OF THIS CHRYSOBERYL THEREFORE ARE 
(Per 100 parts) 
A. Moisture 0.40 
C. Oxide of titanium 1.00 
D. Glucina 15.80 
E. Silica 4.00 
F. Alumina 73.60 
F. Protoxide of iron 3.38 
98.18 
100.00 
locality, 1.5 grammes were analysed, in the manner above 
mentioned, and the following results were obtained :— 
(Per 100 parts) 
Water 0.666 
Oxide of titanium 2.666 
Glucina 16.000 
Silica 5.999 
Alumina 68.666 — 
Protoxide of iron 4.733 
98.730 
100.000 
Loss 1.270 
