THE 



PHILOSOPHICAL MAGAZINE 



C O MP P^ E H E N D I H^G 



THE VARIOUS BRANCFIES OF SCIENCE, 



THE LIBERAL AND FINE ARTS, 

 AGRICULTURE, MANUFACTURES, 



AND 



COMMERCE. 



BY ALEXANDER TILLOCH, 



MEMBER OF THE LONDON PHILOSOPHICAL SOCIETY, ETC. ETC, 



*' Nec aranearum fane textus ideo melior, quia ex fe fila gignunt. Nee nofter 

 viliorquia ex alienis libamus ut apes." Jus r. Lifs. Monit. Polit. lib. i, cap. i. 



VOL. XI. 



LONDON: 



Printed for ALtxA.sDEti Tilloch; 



And Sold by Meffrs. Richardson, Cornhiil ; Cadell and Davies, 



Strand ; DtSRETT, Piccadilly; Muk ray and Highley, No. 32, 



Fleet-ftteet ; Sv monds, Pater-nofter Row ; Bell, No. 148, 



Oxford-ftreet ; Vernok and Iloou, Poultry ; Harding, 



No. 36, St. James's-ftreet ; Bkll and Bradfuts, 



Edinburgh; Brash and Reid, Glaigovvj 



and W. GiLUF.RT, Dublin. 



/ IVUks and Taylor f Printers, Chanctry-X.ane.'\ 



