THE 



PHILOSOPHICAL MAGAZINE 



COMPREHENDING 



THE VARIOUS BRANCHES OF SCIENCE, 



THE LIBERAL AND FINE ARTS, 



AGRICULTURE, MANUFACTURES, 



AND 



COMMERCE. 



BY ALEXANDER TILLOCH, 



KONORAEY MEMBER OF THE ROYAL IRISH ACADEMY, &C« &C. &C. 



" Nee aranearum sane textus ideo metior quia ex se fila gignunt, nee poster 

 vJ!ior (juia ex alieiiis libamus ut apes." jusr. Lips. M<jmt. I'olit. lib. i. cap. i. 



VOL. XVII. 



LONDON: 

 Printed for Alexander Tilloch, 



liy y, 'Tjylur, BUck-Hvrse'Court, FUet-stred : 



And soM by Messrs. Richardson, Cornhill ; CADtLL and Davies, Strand; 



LoNOMAN and Ress, Pater-noster Row; Debrett, Piccadilij ; 



MuiuiAy, No. 32, Fleet-street; Svmonds, Pater-noster 



Row; Bell, No. 14S, Oxford-street; Vernor 



and Hood, Poultry; Harding, No. 36, 



St. James's-street ; Bell and Bradfute, 



tdinburgh; Brash and Reid, Glasgow} 



and Gilbert and Hodges, 



Dublin. 



