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Feuchtwanger: Treatise on Gems

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	PREFACE.



	In none of the numerous works on Mineralogy that have lately been published, have Gems been treated in a manner commensurate with the important rank which they hold in the mineral kingdom. The author of this treatise published in 1838 a small work on Gems, which was well received by the scientific world. As that edition was soon disposed of, the author intended to issue a larger and improved edition, but close application to his legitimate pursuits prevented him from accomplishing that object. In 1851 he visited the London Exhibition, where the treasures of the mineral kingdom, and the profusion of brilliant and costly gems from all quarters of the globe, formed a collection such as had never before been witnessed ; and he then resolved to embody the facts which he had there collected in a new work on Gems, which he has been encouraged to publish by the solicitations of numerous teachers and jewellers, who had used his former treatise as a work of reference, and who wish to have a work that will impart useful and correct information in regard to the locality and value of Gems in the present state of scientific knowledge. As a work on Gems would be incomplete without a treatise on Mineralogy, and as the author did not wish to enter into details foreign to his subject, he was at a loss how to commence ; but on consulting the recent works on the Elements of Mineralogy of Prof. Nichols and Zimmerman, he was convinced that a summary

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Feuchtwanger. Treatise on Precious Stones.

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1 Page 399 second in August and September; and the more rain, the more
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2 Page 401 weight of twenty-four grains is counted as thirty; so that a
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3 Page 398 body on, or by boring a hole in, the shell. The Chinese are
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4 Page 400 At the Pearl Islands, near the Isthmus of Panama, the pearl
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5 Page 406 In 1620, King Philip IV., of Spain, purchased a pear-shaped
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6 Page 401 weight of twenty-four grains is counted as thirty; so that a
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7 Page 402 reach the age of seven or eight years, and in the fourth yea
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8 Page 403 found in the Elster river, in the kingdom of Saxony, from it
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9 Page 404 nearly two millions of francs ; Julius Csesar presented to S
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10 Page 404 nearly two millions of francs ; Julius Csesar presented to S
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11 Page 405 The seed pearls, when quite round, are worth about one hundr
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12 Page 411 and on the Continent ; around Southampton, in England, these
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13 Page 412 Artificial Pearls. Artificial pearls or beads are of variou
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14 Page 406 n 1620, King Philip IV., of Spain, purchased a pear-shaped p
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15 Page 409 near the town of Paterson, New Jersey, went to a neighbori
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16 Page 410 of Messrs. Tiffany & Co., was purchased from Mr. Howell for
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17 Page 415 The shad-fish, as well as the white-fish of our lakes, must
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18 Page 413 decomposition, and for their preservation numerous chemica
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19 Page 414 Heidelberg, Nuremberg, Sonnenberg, Meistersdorf, in Bohemi
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