TH E 



PHILOSOPHICAL MAGAZINE 



COMPREHENDING 



THE VARIOUS BRANCHES OF SCIENCE, 



THE LIBERAL AND FINE ARTS, 

 AGRICULTURE, MANUFACTURES, 



AND 



COMMERCE, 



BY ALEXANDER TILLOCH, 



HBMBBR OF THE LONDON FHILOSOPHICAl- SOCJETIf, ETC. STC, 



<• Nec aranearum fane textus ideo.ipelior, quia eit fe fila gienunt. Nee no(!ef 

 ^ilior <}uii ex ahenis Ubamus ut ape?." Just. Lips. Mw/r. Pollt. lib. i. cap. t. 



VOL. VII. 



LONDON: 



PRINTf.n BY DAVIS, TAYLOR, AND WILKS, CH AMCERY-L ANK, 



For Alexander Tilloch ; and foU by MelTis. Richardsok, 



CornhiU; Cadell and Davies, Strand; D':brett. Piccadilly ; 



Mu.. RAY and Hichley, No. 32, Fleet-ftreet; Svmohus, 



Pater-nofter Row; Bell, No. i<}.8, Oxford-ftreet ; 



VtKNOR and Hoon, Poultry; Hakdinc, No. 36, 



St. James's-ftreet ; West ley, No. 159, Strand j 



J. Remnant, High-ftreet, Bloomftury ; 



W. Remnant, Hamhurch; and 



W. Gilbert, Dublin. 



