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King: Gems or Decorative Stones

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VIII
PREFACE.
nature of the articles seemed of itself to suggest the pro­priety of classing them in two separate groups (especially when the increase of matter necessitated two volumes for their republication) instead of discussing them in mere alphabetical sequence as I had done at first.
To avoid unnecessary repetition, reference is occasion­ally made in this volume to its companion on ' Precious Stones,' but to no great extent, it having been my object to render each division of my subject complete in itself. For the same reason, some observations properly belonging to the other Part, have been reintroduced in this, when absolutely required for the elucidation of the points under consideration.
It would be most ungrateful for me to close my labours in this field of ancient and modern science without avail­ing myself of the occasion to acknowledge great obligation to Mr. Maskelyne, Professor of Mineralogy at Oxford, for the ready kindness with which he has constantly favoured this· pursuit of mine ; by giving his judgment upon the true character of antique materials that I have from time to time submitted to him in all cases of doubt ; by the free access he has allowed me, for the purpose of verifying specimens, to the rich store of mineral treasures so ad­mirably displayed in the department of the British Museum over which he presides ; and lastly, for numerous valuable suggestions that have guided me in many difficult questions to sound and satisfactory conclusions.
During the time these sheets were passing through the press I fortunately obtained permission, for which I have to return most sincere thanks to Mr. Newton, to minutely examine, with exemption from all embarrassing restrictions,
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