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Doc. 198.] 557
A PROSPECTUS.
ratuses. Improvements suggested in their application to
various ores.
13. On the methods of obtaining Vitriol.
14. On the methods of obtaining Alum.
15. On the methods of obtaining Saltpetre.
16. On the methods of obtaining common Salt.
17. On various kinds of furnaces for the extraction of
metals and the purposes of assaying, and on stoves for do
mestic purposes.
18. An investigation into the nature of Fire and the At
mosphere, as far as relates to the treatment of metals and of
salts; which investigation will be based on experiments ob
served in connection with processes made on a large and
small scale.
19. On the various menstruums for promoting the flux of
metals, commonly called cand; and on the matrices of ores.
As in the above work not only those processes will be de
scribed which are in use throughout the whole of Europe, but
also their excellences and defects will be pointed out, and many
things pertaining to the better treatment of metals, which
have been heretofore entirely unknown, will be made public, it
is expected to be of the greatest use to all interested in
the working of metals ; and as it will embrace more than
150 sheets or 1200 pages in quarto, and will be adorned by
more than 40 plates, those who will subscribe for it, will only
have to pay three Dutch florins before the end of the present
year, 1722, and three florins more upon the reception of the
work; while those who have not made any prepayment will
have to pay ten florins for a copy of the work.
The above three florins may be deposited : in Amsterdam,
with Joh. Osterwick, bookseller; in Stockholm, with Werner,
royal printer; in Hamburg, with Hermann Hollius, printer;
and in Leipzig, with Weidmann, the royal bookseller.
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