256 Scientific Intelligence. 



ford, Black Lake area, and the Danville, Orford and Potton area 

 not far distant to the southwest. The serpentines here are dis- 

 connected masses, generally of small extent, in the series of 

 slates, schists and diorites designated as a part of the Cambrian. 

 Serpentine also occurs extensively in the Gaspe Peninsula, but 

 this region has not been developed to any considerahle extent. A 

 full account is given in this volume of the separate mines and 

 the methods of working them ; the various commercial purposes 

 to which asbestos can be applied are also explained at length. It 

 is now found possible to spin asbestos threads so that one, for 

 example, weighing not more than an ounce per hundred yards, 

 has a fair degree of strength. Asbestos cloth and rope are ex- 

 tensively made, and the material is also used for roofing and 

 numerous other purposes, most of them equally familiar. 



11. The Cob alt- Nickel Arsenides and Silver Deposits of 

 Temiskaming / by Willet G. Miller, Provincial Geologist. 

 Pp. 66. Toronto : L. K. Cameron, 1905. Report of The Bureau 

 of Mines, 1905. Part II. Thomas W. Gibson, Director.— The 

 remarkable development of the nickel industry in Canada lends 

 interest to this report of a new deposit of cobalt-nickel arsenides 

 and silver, discovered during the year 1904, during the building of 

 the Temiskaming and Northern Ontario Railwa}^. The minerals 

 identified are native silver, smaltite, niccolite and chloanthite, and 

 associated with these several silver and cobalt minerals of rarer 

 occurrence. The veins are narrow, some 10-12 inches in width, 

 and the ore from the silver-bearing veins is stated to contain 11*4 

 per cent of silver, 11-3 per cent of cobalt, while that from the 

 veins not carrying silver shows 15*6 per cent of cobalt and 7'0 per 

 cent of nickel. The veins occupy vertical cracks and fissures, cut- 

 ting across the slightly inclined conglomerate slate series of the 

 Lower Huron i an. 



12. Economic Geology of the United States / by Heineicii 

 Ries ; 435 pp., 25 pis., 97 figs. New York, 1905 (The Macmillan 

 Company). — This recent publication by Professor Ries of Cornell 

 University is another indication of the increasing consideration 

 given to Economic Geology as an important department of the 

 general subject of geology. An elementary text-book for class 

 room use was greatly needed in this subject and the present book 

 admirably fills that need. The book is about equally divided into 

 two parts : Part I treats of non-metallic minerals and includes, 

 besides others, chapters on coal, petroleum, etc., on building- 

 stones, clay, lime and cements, on salines, gypsum, fertilizers, 

 and abrasives; Part II discusses the metallic minerals and, besides 

 a chapter of general discussion on the subject of ore bodies and 

 their formation, includes chapters which in turn treat of the occur- 

 rences of the important metals. The book is well and profusely 

 illustrated with maps, geological sections, tables and half-tone 

 engravings. A valuable feature is the long list of references 

 which is given at the end of each chapter and which includes all 

 the important papers dealing with the subject of the chapter. 



w. e. f. 



