miomat'ic Society. 3^1 



Papers on the following fubjcfts have alfo been read : 

 An account of an earthquake felt m the vale of Conway, 

 between Conway and Llanrwft, on the I2th of March laft. 



By J. Lloyd, Efq. . , -^r tr 



Experiments on platlna. By Wm. Bmgley, Efq. affay- 



mafter of the Mint. r i • *• 



A poftfcript bv Mr. Howard to his paper on fulminating 

 oxyd of mercury; containing an account of fome experiments 

 made with it at Woolwich ; from which it appears, that I oz. 

 burll a Hull which would have required 7 oz. of gunpowder; 

 and that half the charge of oxyd ufually employed of guti- 

 powder would burft any piece of ordnance. A remarkable 

 property of this preparation is, that when fired with gua- 

 powder the latter does not deflagrate. 



A paper, by S. Schroeter, on the planet Mercury. From 

 his obfervations it appears, that its mountains bear the fame 

 proportion to its diameter as thofe of Venus and the Moon 

 do to theirs, and that the higheft mountains are m its fouthern 

 hemifphere ; alfo, that its rotation on its axis is pertormcd in 

 feventy-four hours. 



PHILOMATIC SOCIETY OF PARIS. 



C Jurine read lately a memoir on the nionoculus caftor 

 Under this name the author includes the ^nonocuh of which 

 Muller very improperly formed three fpecies, vi^. the cy^ 

 clops, c^ruleus, rubens, and lacinulatus. Thec^ruJeusis 

 nothinjr clfe, indeed, than an old female of the rubens ; and the 

 charaaer of the lacinulatus confifts merely in foreign appen- 

 dacres, or a kmd of infufion animals which often adhere to 

 thfs rnonoculus. C. Jurine having fucceffively reduced feveral 

 of thcfe infefts to a ftate of afphyxy by means of a few drops 

 of fpirits thrown into the water which contamed them and 

 havine revived them by adding new pure water, oofcrved, 

 that it is not the heart but the inteftinal canal which re- 

 tains longeft its irritability, and refumcs it the fooneft. 1 he 

 female carries her eggs not m two cluaers, like the greater 

 part of the other cyclops, but in a large bag, which has a 

 nttle refemblance to the tail of the beaver. It is from this 

 circumftance that the author gives to the above Ipccies the 



name 



