of some Calamines . 23 
consist of two matters ; carbonate of zinc, and a peculiar com- 
pound of zinc and water, which may be named hydrate of zinc „ 
By the results of the analysis of the Mendip Hill calamine, 
corrected by the theory, carbonate of zinc appears to consist of, 
Carbonic acid - i 
Calx of zinc 
Deducting from the calx of zinc in the Bleyberg calamine, 
that portion which corresponds, on these principles, to its yield 
of carbonic acid, the remaining quantity of calx of zinc and 
water is in such proportions as to lead, from the theory, to 
consider hydrate of zinc as composed of 
Calx of zinc 
Water, or rather ice - - 
And, from these results, corrected by the theory, I consider 
Bleyberg calamine as consisting of. 
Carbonate of zinc - - A 
Hydrate of zinc -i. 
The test of this hypothesis, is in the quantities of the remote 
elements which analysis would obtain from a calamine thus 
composed. 
The following table will show how very insignificantly the 
calamine compounded by the theory, would differ in this respect 
from the calamine of nature. 
