THE 



PHILOSOPHICAL MAGAZINE 



COMPREHEXDINO 



THE VARIOUS BRANCHES OF SCIENCE, 



THE LIBERAL AND FINE ARTS, 



AGRICULTURE, MANUFACTURES, 



AND 



COMMERCE. 



BY ALEXANDER TILLOCH, 



M.R.I.A. F.S.A. Ebin. ano PtRTU, &C. 



-' Nf c aoncarum sar.e teztiis ideo melior quia ex se fila gi^nunt, nee nostei 

 •.ior quia ex alisnis iibacius ut apeS." ,,^vir. Lira.Mtnit. i'ciit. lib. i. cap. i. 



VOL. XXXIV. 



k-or JULY, AUGUST, SEPTFMBER, OCTOBER, hWEMBER, 



and DECEMBER,'<tQV9. 





LONDON: ^.^r^^f.sO' 



TRINTED BY RICHARD TAYLOR AND CO., SHOE LANE: •■«r-rr. •■^-'' 



And sold by Ricuabdsoks ; Cadeil and Daviks; Longman, Hurst, 



Rkks, and Ohms, , Vi.rnor, Hood, and SiiAKPr; Murrai ; 



Hiciilet: HiiF.RwooD and Co; Harding; l.cindon: 



Bfm. and Bradfute, nnd Constabi.c and Co. 



Edinl.iir.^li: Brash and Rfid, and Nivkm, 



f '.lasgow; £c Gilbert &. Hoeo».?, Dublin. 



