THE 



PHILOSOPHICAL MAGAZINE 



COMPREHENDING 



' THE VARIOUS BRANCHES OF SCIENCE^ 

 THE LIBERAL AND FINE ARTS, 

 AGRICULTURE, MANUFACTURES, 



AND 



COMMERCE* 



BY ALEXANDER TILLOCH, 



MEMBER OF THE LONDON PHILOSOPHICAL SOCIETY, ETC. ETC. 



** Nee aranearum fane textus ideo melior, quia ex fe fila gignuht. Ncc nofter 

 v\\\i>x quia ex alicnis libamus ut apes.'* Just. Lips. Montt. Polity lib. i. cap, i. 



<C-'f-> >}:• 



VOL. IX. 





LONDON: 



PRIKTED BV DAVIS, TAVLOR^ AND WILKS, CHANCERY- LAK«, 



For Alexander Tilloch ; and fold by Meffrs. RiCHAkasoK, 



Cornhill; Cadell and Davies, Strand; Drbrett, Piccadillyi 



Murray and Highley, No. 32, Fieet-ftreet ; Symonds, 



Pater-nofter Row; Bell, No. 14H, Oxford-ftreet j 



Verkor and Hood, Poultry; Hakdin'g, No. 36, 



St. James's-ftreet ; Bell and Bradfote, 



Edinburgh; Brash and Reiu, Glafgow ; 



i^nd W- rn.iiERT, Dublin. 



