THE 



PHILOSOPHICAL MAGAZINE 



COMPREHENDING 



THE VARIOUS BRANCHES OF SCIENCE, 



THE LIBERAL AND FINE ARTS, 



AGRICULTURE, MANUFACTURES, 



AND 



COMMERCE. 



BY ^ LEX AND E R TILL CH, 



HONORARY MEMBER OF THE ?OYAL IRISH ACADEMY, &C, &C. 8iC. 



" Nee aranearum sane tcxttis idco tnclJor quia ex se fila gignunt, nee noster 

 vilior quia ex aiienis libamus ut apes." Just. Lips. Monit, Polit. lib. i. cap. i. 



VOL. XX. 



LONDON.- 



Printed ly 7L Taylor and Co., Black-Horse-Courl, Fleet-street : 



And sold by Messrs. Richardson; Cadell and Davies ; Longman, 



Hurst, Rees, andORMt:; Symonds; Murrav; Highlev; 



Vernor and Hood; Harding; London: Bell and 



IjRadfute, Edinburgh; Brash and Reid, and 



D. Nevik, Glasgow ; and Gilber r 



and HoDGRS, Dublin. 



1805. 



