Geology and Mineralogy. 405 



The following valuable maps have been issued by the Depart- 

 ment of the Interior, James White, Geographer. 



Relief Map of the Dominion of Canada, scale 100 miles to one 

 inch. 



Resource Map of the Dominion of Canada with statistics of 

 productions, scale 197*3 miles to an. inch. 



Standard topographical Map, Ontario, Windsor sheet, sheet 1, 



s.w. 



7. Mica : its Occurrence, Exploitation and Uses ; by Fritz 

 Cirkel. Pp. 148, with colored map. Ottawa, 1905. Mines 

 Branch, Department of the Interior. — This bulletin is similar in 

 scope to the one on asbestus before noticed (p. 255) and also deals 

 with a very important industry. In 1902, Canada ranked next to 

 India in the production of mica, yielding nearly an amount valued 

 at $250,000, or about one-quarter of the world's supply. The mica 

 is, in part, muscovite, which is obtained from pegmatite veins or 

 dikes in the Laurentian formation, the best deposits being those 

 of the Saguenay District on the Lower St. Lawrence, with others 

 north of Ottawa and elsewhere. A considerable part of the mica, 

 however, is obtained from phlogopite, workable deposits of which 

 are confined to Canada. These deposits exist particularly in an 

 area of 520 square miles included in the country north of Ottawa, 

 in the townships of Burgess, Lanark and Loughborough, prov- 

 ince of Quebec. The horizon of mica deposits is confined to the 

 upper portion of the Laurentian siliceous rocks which underlie 

 the limestone proper. These gneisses are generally of gray or 

 reddish gray appearance, with hornblendic bands, nearly all of 

 which are highly siliceous. These beds penetrate through the 

 calcareous layers into the massive crystalline limestone formation. 

 In the Buckingham and Templeton areas, apatite and mica are 

 seldom found in the crystalline limestone, but in the Gatineau 

 area several large dikes of pyroxene occur in this formation, 

 carrying workable mica deposits. Two classes of deposits are 

 distinguished: 1. Contact deposits, forming the contact between 

 the gneiss and pyroxene, and 2. pocket deposits, occurring in fis- 

 sures wholly in pyroxene, or on the contact between intrusive 

 feldspar or diorite and pyroxene. The former deposits are the 

 most important from a mining point of view. 



8. JBeitrage zur Mineralogie von Japan, No. 2, pp. 23-74. — 

 The second number of the Contributions to the Minerology of 

 Japan, edited by T. Wada, contains several mineralogical papers, 

 one of which, on crystals of the new mineral naegite (this Journal, 

 xix, 90), deserves special mention. A paper descriptive of Japanese 

 meteorites by K. Jimbo is also important, giving new facts and 

 correcting various errors in foreign catalogues as to time and 

 place of fall. It is stated that thirty metorites have thus far been 

 discovered in Japan, representing sixteen distinct falls ; most of 

 these are stones. 



9. Studies in Fluorite. — A recent paper by Harry W. Morse 

 discusses in detail the fluorescence and thermo-luminescence of 

 fluorite and also the nature of the gaseous and liquid inclusions. 



