Vol. 57. 



April 1821. 



No. 276. 



Published the Last Day of every Month, 

 [PRICE Us. 6d.] 



THE 



PHILOSOPHICAL MAGAZINE 

 AND JOURNAL: 



COHFBEHBNOING 



THE VARIOUS BRANCHES OF SCIENCE, 



THE LIBERAL AND FINE ARTS, 



GEOLOGY, 



AGRICULTURE, 

 MANUFACTURES AND COMMERCE. 



NUMBER CCLXXVI. 

 For APRIL 1821. 



WITH A PLATE BY PORTER, 



Illustrative of Mr. Jamieson's Marine Thermometer Case, and ' 



Mr. Jennings's Mercurial Log-Glass. 



BY ALEXANDER TILLOCH, 



M.R.I.A. M.G.S. M.II.A.S. MUNICH, F.8.A. EDIN. ANDPEUTH, 

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



LONDO N: 



PRINTED BY RICHARD AND ARTHUR TAYLOR, SHOE-LANE : 



And sold by Cadell and Davies ; Longman, Hurst, Rbes, 

 Or ME, & Brown; Hi g h le y ; Sherwood and Co. ; Harding;! 

 Underwood; Si mpkin and Marsh all ; London: Constable f 

 and Co. Edinburgh: Brash and Reid.; Duncan; and Pbk-^ 

 MAN, Glasgow: and Gilbert and Hodoes, Dublin. 



