Gems and Gem Minerals 



By Oliver Cummings Farrington^ PhD* 



Curator of Geology^ The Field Columbian Museum 



PRICE, POSTPAID, $3*0 



Every Library should have a copy* 



This book is attractively bound in cloth, with lettering in gold, 

 Size, 11x8 inches. Pages, 22g-\-xu. Illustrated with sixty-one half- 

 tones and line cuts; also Sixteen Full- Page Plates (^io6 specimens) of Gems 

 and Ornamental Stones in their natural colors. 



This tells the story in a nut-shell. No authoritative work on this 

 subject, with colored plates, was ever offered at so low a price before, 

 and it would be impossible to do it now but for the publisher's superior 

 facilities. The colored plates, if mounted in frames, would ornament 

 the walls of any r^om. The set of colored plates is alone worth several 

 times the price of the book. 



The author has done his work so well that the book ought to be as 

 popular with the general public as it will be among mineralogists. 



That the book is up-to-date an examination of its pages will show. 

 It trears of the nature, color, occurrence and mining of gems. The 

 luster, hardness, specific gravity, its optical and electrical properties, 

 phosphorescence and fluorescence. Their crystal form, cutting and 

 moun ing, valuation and price. Imitation gems and how to detect them. 

 Superstitions, etc., regarding gems. 



Among its half-tones and line cuts are views of the Haddam 

 Tourmaline locality, Mt. Paris Tourmaline Deposit, Diamond Digging 

 and Mining in Brazil, Diamond Mines at Kimberley, Opal Mining in 

 New South Wales, Obsidian liff, Yellowstone Park, orundum Mine, 

 North arolina, and other equally interesting illustrations. 



This beautiful and interesting book will be sent, postpaid, on re- 

 ceipt of price. 



A copy of this book and '^Birds and Nature'^ one year for $3»50 



" Gems and Gem Minerals " is the best book published up to the present time as 

 regards text, illustration and exact facts for a low price and useful to every mineral- 

 ogist or collector of gems." — George F. Kunz. 



A. W. MUMFORD & CO., Publishers, 

 378 Wabash Avenue - - - - - Chicago 



