316 JV. A 7 ". Evans — Chrysoberyl from Canada. 



The electrolyte, which is sulphuric acid of sp. gr. L20, comes 

 into contact with the paste inside the electrodes through a 

 number of holes, in the latter, of 3 mm diameter. A layer of 

 Rowland's Universal wax* pasted on to the cork keeps the acid 

 from creeping out. The electrodes can be made more easily 

 of sheet metal by cutting in the form shown in tig. 3, then 

 rolling it into a cylinder. In case it is desired to make a great 

 number of these cells, a die may be made by which sheet metal 

 can be punched out into the desired shape. 



These cells have a capacity of about one ampere-hour and 

 give a potential difference of a little over two volts. They 

 keep this potential difference for several months without 

 recharging. 



I wish to express my thanks to Professors C. S. Hastings and 

 H. A. Bumstead for their kind interest in and valuable sug- 

 gestions on this work. 



Sheffield Scientific School of Yale University, 

 March, 1905. 



* Ames and Bliss, A Manual of Experiments in Physics, p. 496. 



Art. XXXI. — Chrysoberyl from Canada / bylSEViL Norton 



Evans. 



The mineral chrysoberyl is not one of very limited occur- 

 rence, but as yet it has not been reported from any Canadian 

 locality, although rocks apparently similar to those in which it 

 is found elsewhere occur over large areas in Canada. When 

 therefore this mineral was identified in a rock from the Prov- 

 ince of Quebec, it was thought well to analyse and describe it, 

 so that the species from this locality might be compared with 

 the same species from other places. The facts concerning its 

 occurrence have been kindly supplied by Dr. F. D. Adams of 

 McG-ill University, who collected the specimens. 



The locality where the chrysoberyl was found is situated in 

 the County of Maskinonge in the Province of Quebec, about 

 100 miles in a northerly direction from Montreal. It is thus 

 beyond the limit of the settled country and in the woods, in a 

 district which has not as yet been surveyed into townships. 

 The spot is situated on the Riviere du Poste, a tributary of 

 the River Matawin ; this river iu its turn is a tributary of the 

 St. Maurice River, which runs into the St. Lawrence at the 

 town of Three Rivers. It is about one mile below the forks 

 of the Riviere du Poste, where the streams from Lac Long 

 and Lac Clair run together, and is thus about thirteen miles in 

 a straight line north of the point where the Riviere du' Poste 



