THE 



PHILOSOPHICAL MAGAZINE: 



COMPREHENDING 



THE VARIOUS BRANCHES OF SCIENCE, 



THE LIBERAL AND FINE ARTS, 

 AGRICULTURE, MANUFACTURES, 



AND 



COMMERCE. 



BY ALEXANDER TILLOCH, 



HONORARV MEMBER OF THE ROYAL IRISH ACADEMY, &C. &C. ScC, 



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

 •ilior quia ex alienis libamus ut apes." Just. Li ps. Manit. Polit. lib. i. cap. i. 





VOL. XV. 



LONDON: 



pRiNTEi> FOR Alexander Tilloch ; 



And Sold by Meffrs. Richaruson, CornliiU ; Cadf.ll and Davies, Strand; 



LoNoMAs and RtEs, Pater-nofter Row; Debkktt, PiccadiUyi 



MuiiRAY, No. 3', Fleet-ftreet ; Symonds, P.nter-noller 



Row; Bkll, No. 148, Oxfoid-ftreet ; VtRNOR 



umd Hood, Poultry ; Harding, No. 56, 



St. J.imes's-ftrcet ; BFLLand BKADFUTt, 



KdinbiuRli; Brash and REin.Glal'gow; 



and W. Gilbert, Dublin. 



r%^ 1803. 



liyiUt and 7ayl r, Pr'mtcn, CLanctryLani.'] 



