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.THE 



PHILOSOPHICAL MAGAZINE 

 AND JOURNAL: 



COMPBEHBNDINO 



THE VARIOUS BRANCHES OF SCIENCE, 



THE LIBERAL AND FINE ARTS, 

 GEOLOGY, 



AGRICULTURE, 

 MANUFACTURES AND COMMERCE. 



NUMBER CCLXXIV. 

 For FEBRUARY 1821. 



BY ALEXANDER TILLOCH, 



M.11.I.A. M.G.S. M.Il.A.S. MUNICH, F.S.A. EDIN. AKDPEllTH, 

 M.S.E.I.N. OF FRANCE, &C. &C. &C. 



LONDO N: 



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