of some Calamines. 21 
the foregoing small crystals of carbonate of zinc, on crystals 
of carbonate of lime. Their form seems, as far as their minute- 
ness and compression together would allow of judging, nearly 
or quite the same as that of those from Regbania; and the least 
atom of them immediately evinces its nature, on being heated, 
by the strong electricity it acquires. On their solution in acids, 
they leave quartz. 
OBSERVATIONS. 
Chemistry is yet so new a science, what we know of it bears 
so small a proportion to what we are ignorant of, our know- 
ledge in every department of it is so incomplete, so broken, 
consisting so entirely of isolated points thinly scattered like 
lucid specks on a vast field of darkness, that no researches can 
be undertaken without producing some facts, leading to some 
consequences, which extend beyond the boundaries of their im- 
mediate object. 
1. The foregoing experiments throw light on the proportions 
in which its elements exist in vitriol of zinc. 23.0 grs. of the 
Mendip Hill calamine, produced 29.8 grs. of arid vitriol of zinc. 
These 23.0 grs. of calamine contained 14.9 grs. of calx of 
zinc ; hence, this metallic salt, in an arid state, consists of exactly 
equal parts of calx of zinc and vitriolic acid. 
This inference is corroborated by the results of the other 
experiments: 68.0 grs. of the Bleyberg calamine, containing 
48.6 grs. of calx of zinc, yielded 96.7 grs. of arid vitriol of 
zinc ; and, in another trial, 20.0 grs. of this ore, containing 14.2 
grs. of calx of zinc, produced 28.7 grs. of arid vitriol of zinc. 
The mean of these two cases, is 62.7 grs. of arid vitriol of zinc, 
from 31.4 grs. of calx of zinc. 
