--THE HEAVY METALS: Copper, Silver, Gold, Zinc and Cadmium,
Mercury, Tin, Lead, Bismuth, Antimony, Chromium, Molybdenum, Tungsten,
Uranium, Manganese, Iron, Nickel, and Cobalt, the Platinum Group.
"COMPREHENSIVE and AUTHORITATIVE ... not only FULL of VALUABLE
INFORMATION, but gives evidence of a THOROUGH INSIGHT into the technical
VALUE and POSSIBILITIES of all the methods discussed."--_The
Electrician._
"Dr. BORCHERS' WELL-KNOWN WORK ... must of NECESSITY BE ACQUIRED by
every one interested in the subject. EXCELLENTLY put into English with
additional matter by Mr. MCMILLAN."--_Nature._
"Will be of GREAT SERVICE to the practical man and the
Student."--_Electric Smelting._
* * * * *
_In Large 4to, Library Style. Beautifully Illustrated with 20 Plates,
many in Colours, and 94 Figures in the Text._
~PRECIOUS STONES: Their Properties, Occurrences, and Uses.~
_A Treatise for Dealers, Manufacturers, Jewellers, and for all
Collectors and others interested in Gems._
BY DR. MAX BAUER, Professor in the University of Marburg,
TRANSLATED BY L.J. SPENCER, M.A. (CANTAB.), F.G.S.
GENERAL CONTENTS.--General Properties of Gems: Their Natural Characters,
Occurrence, Application, and Uses.--Detailed Description of Particular
Gems: The Diamond, Rubies, Sapphires; Emeralds, Tourmalines, and Opals;
Felspars, Amphiboles, Malachite.
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