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556 SWEDENBORG AS A MAN OF SCIENCE. [Doc. 198.
will obtain it at scarcely half the price which it would otherwise
cost him.
The contents of the work will be as follows:
[Introduction ]: On Minerals in general.
1. On Copper-ore ; its varieties and qualities, and the
signs by which it may be known.
The methods of treating it followed in Germany, Hungary,
Sweden, etc.; also of fusing it into copper stone. The various
modes of calcining it, and by repeated fusion of extracting the
copper from it. Its purification; accompanied by drawings of
the various furnaces.
On assaying it in small quantities, giving the various methods
followed by assayers generally, and also by the author.
An opinion concerning the excellence and the defects of
the various processes by which the metal is obtained in large
and small quantities.
Improvements proposed in the processes and furnaces for
obtaining the metal in larger and smaller quantities.
2. On Silver, and its ore; the various methods used in
calcining, fusing, and assaying the same; their excellence and
their defects. Improvements proposed in the processes and
.
furnaces, which are similar to those recommended for copper.
3. On a similar treatment of Lead.
4. On a similar one of Gold.
5. On the methods of separating gold and silver from
lead, copper, and other metals, in large as well as in small
works; together with drawings of the furnaces, and suggestions
towards better processes.
6. On a similar treatment of Quicksilver.
7. On a similar treatment of Iron.
8. On a similar treatment of Tin.
9. On a similar treatment of Zinc and Calamine. The con
version of copper into Brass.
10. On a similar treatment of Bismuth, Cobalt, Antimony.
11. On the methods of separating ores containing several
metals, sulphur, arsenic, stones, etc., both in large and small
quantities.
12. On the methods of crushing metals, and separating
them by water, by the so -called crushing and washing appa
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