HINTS FOR OFFICERS IN THE DETECTION OF PRECIOUS STONES. 17 
«¢Prucious Stones AND Gems,’ By H. W. SrReerer.” 
Publishers “George Bell & Sons, Covent Garden,” price 15s. A 
standard work on the subject, with coloured illustrations of many 
stones in their rough condition. Mr. Streeter is a well known 
expert and generally summoned as such in law cases. I think 
however that Emanuel gives more value for 6s. than Streeter for Ls. 
Both books should be purchased by anyone who intends really studying 
the subject. 
When these have been perused, and the reader requires more, he 
will find much learned gossip upon jewels of all kinds in the most in- 
teresting works of the Rev. C. W. King, M.A., of Cambridge. ‘They 
are published in Bohn’s 6s. series, and are entitled— 
“Precious Stones and Metals.” ‘Gems, or Semi-precious Stones.” 
They are beautifully written works, of great value to anyone who 
cares for the romantic side of the subject, or for its connection with 
antiquity. Here and there they give hints as to localities whence the 
Romans drew their gems, and which would repay search in the present 
day. Itis worth studying the author’s remarks on the emerald mines 
of Egypt, now that we are in occupation of that country. But the 
reader must consult the books for himself, as I have already exceeded 
the limits I had proposed for my paper. 
TABLE I. 
CoLours OF PRECIOUS STONES WHEN TRANSPARENT. 
WHITE. 
Apophyllite ; beryl; diamond; garnet; moonstone; phenakite; quartz (rock 
crystal); sapphire; sphene; spinel; topaz; tourmaline; zircon (jargoon). 
BLUE. ’ 
Anatase ; Beryl; diamond; ezclase; iolite; sapphire; spinel; topaz; tour- 
maline. 
RED. 
Apophyllite ; chrysoberyl; diamond; garnet; ruby; spinel; tourmaline ; 
zircon (jacinth). 
YELLOW. 
Beryl; chrysoberyl; diamond; ewclase; garnet (cinnamon stone); oriental 
topaz; phenakite; quartz; sphere; spodumene; topaz; tourmaline; zircon 
(jargoon). 
ORANGE. 
Diamond; garnet; quartz; spinel; topaz; tourmaline; zircon (jacinth). 
GREEN. 
Beryl; chrysoberyl; diamond; diopside; emerald; epidote; ewclase; garnet 
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