Vol 



Published the Last Day of every Month, 

 [PRICE 2s. 6d.] 



THE 



PHILOSOPHICAL MAGA^I-NE 

 AND JOURNAL: '^ 



COMPRBHBNDINO 



THE VARIQUS BRANCHES.OF SCIENCE, 



THE LiMRAL and FINE ARTS, 



■q E O L O G Y, 



AGRICULTURE, 



MANUFACTURES AND COMMERCE. 



NUMBER CCLXV. 

 For MAY 1820. 



BY ALEXANDER TJL LOCH, 



M.Il.I.A. M.O.S. M.R.A.S. MUNICH, Ji;^. ZnlS . AND PERTH, &e. 



LONDON:^ 



PRINTED BV RICHARD AND ARTHUR TAYLOR, SHOE-LAKE : ara m 



ym III! 

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UnDER'.VOODV SlMlMCIN ifndMARSHALL ; LouJon: CONSTAIILE ^jJI 



and Co, Edinburgh: Brash and Ri-.iu ; Duncan; and Pen- ^^ 

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