No. 277. 



Published the Last Day of every Month, 

 [PRICE '2s. 6d.] 



THE 



PHILOSOPHICAL MAGAZINE g 



AND JOURNAL: 



C0HFBEHBNDIN6 



THE VARIOUS BRANCHES OF SCIENCE, 



THE LIBERAL AND FINE ARTS, 



GEOLOGY, 



AGRICULTURE, 

 MANUFACTURES AND COMMERCE. 



NUMBER CCLXXVII. 

 For MA Y 1821. 



WITH A PLATE BY PORTER, 



IlKistrutive of Dr. Hare's new Modification of Galvanic 

 Apparatus. 



BT ALEXANDER TIJ.LOCH, LL.D. 



M.n.t.A. M,0.». M.A.S. F.S.A. EUl N. AND PEKTH ; CORRESPO.VDI NO .MEM-^ 

 UEH OF THE ROYAI. ACADEMY OF SCIENCES, MUNICH i AND OF THE 

 ACADEMY OP SCIENCES, LlfBKATl'UE AND ARTS, tliOHOHN, it';, itf.- 



LONDON: 



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