No. 300. 



Published the Last Day of every Month. — Price 2s, 6d. 



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THE 



PHILOSOPHICAL MAGAZINE 



AND JOURNAL: 



COMPREHENDING 



THE VARIOUS BRANCHES OF SCIENCE, 



THE LIBERAL AND FINE ARTS, 



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NUMBER CCC. 

 Vlr APRIL 1823. 



V/ITH A PLATE 

 Illustrative of Mr. Tatum's Communication on Electro- 

 Magnetism. 



By ALEXANDER TILLOCH, LL.D. 



M.R.I.A. M.G.S. M.A.S. F.S.A. EDIN. AND PERTH; CORRESPONDING MEMBER OF THK 

 KOYAL ACAUEinr OF SCIENCES, MUNICH; AND OF THE ACADEMT OP SCIENCES, 

 LITERATURE AND ARTS, LEGHORN, ETC. 



And RICHARD TAYLOR, F.L.S. 



MEMBER OF THE ASTRONOMICAL SOCIETY OF LONDON. 



LONDON: 



rni.STf.D BV RICIIAKO TAYI.OB, SHOr.-l.A.N E .* 



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