472 Canadian Record of Science. 



cup not larger than \ of an inch in diameter, the opening at 

 the bottom of the tube is closed by a ground glass plug 

 which being ground in oifers a rough surface on which the 

 particles of sediment would certainly lodge. The design, 

 however, is in either respect quite similar to the one 

 described above. 



Short Notes on some Canadian Minerals. 1 



By W. F. Fereiee, B.A.Sc, F.G.S., Geological Survey of Canada. 



(Communicated by permission of the Director.) 



It is the intention of the writer in the following short 

 notes to place on record a few new localities of some Cana- 

 dian minerals, and also to call attention to the interesting 

 forms in which, in several instances, they occur at these 

 and other localities already known. 



1. Native Arsenic. 



A year ago a specimen was received from Mr. Charles 

 Brent, Mining Engineer, of Port Arthur, Ont., which con- 

 tained this mineral in some quantity. 



The locality is given as Edwards Island, Thunder Bay 

 District, Lake Superior, nine miles east of Silver Islet, and 

 the ore, of which the arsenic forms a part, is said to have 

 yielded in selected samples as high as 130 oz. silver to the 

 ton, the average being about 75 oz. 



The arsenic occurs, in the specimen examined, in small 

 reniform masses, tarnished to a dark-grey color and imbed- 

 ded in a white cleavable calcite which forms small patches 

 in a dark-grey, fine-grained, crystalline limestone. 



It greatly resembles in appearance that found at Joachims- 

 thal, in Bohemia. 



Blende, galenite, pyrite, and chalcopyrite were observed 

 as associated minerals, and native silver is also said to occur 

 rather plentifully with it. 



The Silver Islet Consolidated Mining and Land Co. during 



1 One of the species described, the Molybdenites is from Labrador. 



