THE 



PHILOSOPHICAL MAGAZINE 

 AND JOURNAL: 



COMPREHENDING 



THE VARIOUS BRANCHES OF SCIENCE, 

 THE LIBERAL AND FINE ARTS, 



GEOLOGY, 



AGRICULTURE, 



MANUFACTURES, AND COMMERCE. 



BY ALEXANDER TILLOCH, 



MJl.I.A. M.G.S. F.S.A. Edin. and Perth, M.R.A.3. Mdnich, M.S.EJ.N. 

 OF France, &c. &c. &c. 



" Nee aranearum sane textus ideo melior quia ex se fila gignunt, nee noster vilior quia 

 ex aJienis libamus ut apes." Just. Lips. Monit. Polit. lib. i. cap. 1. 



VOL. LVI. 



For JULY, AUGUST, SEPTEMBER, OCTOBER, NOVEMBER, 

 and DECEMBER, 1820. 



LONDON: 



raiNTED BY BICHARD AND ARTHUR TAYLOR, SHOB LANB: 



And sold by Cadell and Davies ; Longman, Hurst, Rees, Orme, and 



Buown; HiGHLEr; Sherwood and Co.; Haroinc. ; Unixk- 



wooDjSiMPKiN and Marjhali., London: Constable 



and Co. Edinburgh I Brash and Rcio; Duncan 



and Penman, Glasgow: and Gilbert and 



HuDcss, Dublin. 



