Hindu Achievements in Exact Science: A Study in the History of Scientific Development c16.11

c16.11

(*a*) In the preparation of
> (1) Perchloride of mercury;
> (2) Sulphide of mercury;
> (3) Vermilion from lead, etc.
(*b*) In the extraction of
> (1) Copper from sulphate of copper;
> (2) Zinc from calamine;
> (3) Copper from pyrites, etc.