Vol. 61. 



May 1823. 



No. SOI. 





THE 



PHILOSOPHICAL MAGAZINE 



AND JOURNAL: 



COMPREHENDING 



THE VARIOUS BRANCHES OF SCIENCE, 



THE LIBERAL AND FINE ARTS, 



AGRICULTURE, MANUFACTURES,. 



AND COMMERCE. 



NUMBER CCCI. 

 For MAY 1823. 



By ALEXANDER TILLOCH, LL.D. 



M.tt.T.A. M.G.S. M.A.S. F.S.A. F.DIN. AND PERTH; CORRESPONDING MEMBER Of THR 

 Bo'vAL ACADEMY OF SCIENCES, MUNICH; AND OF THE ACADEMT OF SCJEUCJtS, 

 LITEHATURE ASD ARTS, LEGHORN, ETC. 



And RICHARD TAYLOR, F.L.S. 



MEMBER OF THE ASTRON^OMICAL SOCIETV OP UJNBON. 



LONDON: 



PniNTKI) BY nirilAIlD TAYI.OII, gliaE-LANF.: 



Soil by Cadcll ; I.on;,'nian, I Inrst, Recs, Ormc, -.iiul Brown ; Raldwin, Cnulock, 

 aiidJoy; Hi^hley; Slierwooil, Nct-ly, aiul .Tones; liar.lm«; Underwood; 

 Siin[>Uiu and'' Marshall; London :— and by Constable ajid (Jo. Edinburgh; 

 and I'ennian, Glasjtow. 



