It
would, however, be more economical and, considering the large amount
of cyanide present, more profitable to work it up into Prussian blue.
* * * * *
A NEW CATALOGUE OF VALUABLE PAPERS
Contained in SCIENTIFIC AMERICAN SUPPLEMENT during the past ten years,
sent _free of charge_ to any address. MUNN & CO., 361 Broadway, New
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THE SCIENTIFIC AMERICAN
ARCHITECTS AND BUILDERS EDITION
$2.50 A YEAR. SINGLE COPIES, 25 CTS.
This is a Special Edition of the SCIENTIFIC AMERICAN, issued
monthly--on the first day of the month. Each number contains about
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pages, forming, practically, a large and splendid Magazine of
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A special feature is the presentation in each number of a variety of
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including those of very moderate cost as well as the more expensive.
Drawings in perspective and in color are given, together with full
Plans, Specifications, Costs, Bills of Estimate, and Sheets of
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