Electrical Attraction of Quartz. 15 



General Meeting, November i6th, 1887. 



Professor BALFOUR STEWART, LL.D., F.R.S., President, 

 in the Chair. 



Mr. John J. Ashworth, of Manchester, was elected 

 an ordinary member. 



Ordinary Meeting, November i6th, 1887. 



Professor Balfour Stewart, LL.D., F.R.S., President, 

 in the Chair. 



On behalf of the members, the President presented 

 to Mr. William Roscoe a silk purse containing forty 

 sovereigns (a special donation of five pounds from the 

 Microscopical and Natural History Section being included), 

 on the occasion of Mr. Roscoe's retirement from the service 

 of the Society as its house-keeper. It was intimated that 

 an engrossed copy of the vote of thanks to Mr. Roscoe, 

 passed at the last Annual Meeting, would be forwarded to 

 him. 



On the Electrical Attraction of Quartz, and the unsuit- 

 ability of this substance as a protecting medium for 

 compasses, watches, &c. By Alex. Hodgkinson, 

 M.B., B.Sc. 



Quartz, like most other substances, becomes electrified 

 by friction, and also possesses the property of remaining 

 in an electrified condition for a period varying from ten 

 minutes to half an hour after the friction has ceased. When 

 this medium is used as a cover for compasses, this electrical 



