THE 



PHILOSOPHICAL MAGAZINE 

 AND JOURNAL: 



COMPREHENDING 



THE VARIOUS BRANCHES OF SCIENCE, 

 THE LIBER AI^ AND FINE ARTS, 



GEOLOGY, 

 AGRICULTURE, 



MANUFACTURES AND COMMERCE. 



BY ALEXANDER TILLOCH, 



M.R.I.A. F.S.A. Edin. and Perth, &c. 



« Nee aranearum sane textus uleo melior quia ex se fila gignunt, nee noster 

 vilior quia ex aliciiis libamus ut apes." Jusr. laps. Munit. I'olit. lib. i. cap. i. 



^^^^X^'' W VOL. XLIX. 



'^iFJJf^ARY, FEBRUARY, MARCH, APRIL, MAY, 

 and JUNE, 1817. 



LONDON: 



TRINTED BY RICHARD AND ARTHUR TAYLOR, SHOE LANE: 



And Kold by Cadell and Davik". ; Longman, Hurst, Rets, Orme, and 



Brown; Murray; Higuley; SnERwooD and Co.; Harujng ; 



Unherwood, London: Constable and Co. Edinburgh! 



BnAsii andRiiD; Duncan; and Penman, Gla.sgow; 



and GiLBtRT and Hodges, Dublin. 



