THE 



PHILOSOPHICAL MAGAZINE 

 AND JOURNAL: 



COMPREHENDING 



THE VARIOUS BRANCHES OF SCIENCE, 

 THE LIBERAL AND FINE ARTS, 



GEOLOGY, 



AGRICULTURE, 



MANUFACTURES, AND COMMERCE. 

 BY ALEXANDER TILLOCH, LL.D. 



M.R.I. A. W.G.S. M.A.S. F.S.A. EDIN. AND PERTH ; CORRESPONDING JIE.MBF.H 

 or THE ROYAL ACADEMY OF SCIENCES, MUNICH ; AND OF THE ACADEMY 

 OF SCIENCES, LITERATURE AND ARTS, LEGHORN, &C. &:C. &C. 



" Nec aranearum sane textus ideo mclior quia ex se fila gignunt, nee noster vilior quia 

 €X alienis libamus ut apes." Just. Lips. Monit. Polit. lib. i. cap. 1. 



VOL. LVII. 



For J Ay VARY, FEBRUARY, MARCH, APRIL, MAY, and 

 JUNE, 182L 



LONDON: 



rRINTF.D BY RICHARD AND ARTHUR TAYLOR, SHOE LANB: 



And sold by Cadell and Davies ; Longman, IIiiniT, Rrr.s Or.mk, m\A 



Urown; Hiciii.r.r; Sherwood and Co.; HAKbiNt; ; U.mif.r- 



wood; Sim PK IN and Marshall, London : Consiablk 



and Co. Ldinburgli: and Penman, Glasgow. 



