470 



Proceedings of Philosophical Societies, [June, 



Ivory , . . e . . « 7 grains^ 



Box wood . . . > 14 



Down . . « 16 



Wool 18 



Beech 28 



Vn Dryness produced in Air hy different Earths, 



Mr. Leslie has ascertained by experiment that when hi^ 

 hygrometer is inclosed in a glass vessel with the following earthy 

 substances, it indicates the following degrees of dryness at the 

 temperature of 60° Fahrenheit - 



Alumina =84^ 



Carbonate of Magnesia .75 



Carbonate of lime 70 



Silica , .40 



Carbonate of barytes .32 



Carbonate of strontian 23 



Models of Crystals. 

 Mineralogists will learn with pleasure that Mr. Larlcin, 

 No. 5y Gee-street^ Clarendon-square, Somer's-town, London, 

 has begun to cut models of crystals, according to the system of 

 Haiiy, in w^ood ; which he sells at a moderate rate. Complete 

 sets of all the crystals described by Haiiy may be had for about 

 15/, ; or any part of the series wished for by mineralogists may 

 be had separately. The crystals are remarkable for their beauty, 

 and they are cut with uncommon accuracy. We have no doubt 

 that as soon as Mr> Larkin's models of crystals become generally 

 known every mineralogist vvill furnish himself with a set. 



Article XI, 



Proceedings of Philosophical Societies » 



ROYAL SOCIETY. 



On Thursday the 29th of April the paper by Berzelius and 

 Marcet gn the Alcohol of sulphur was continued. They obtained 

 this substance by subliming sulphur through red-hot charcoal in 

 a porcelaine tube, and receiving the product in water. Thus 

 obtained it was usually of a yellow colour, from an excess of 

 sulphur which it contained; but it was reduced to a state of 

 purity by distilling it in a glass retort. 



