THE 



PHILOSOPHICAL MAGAZINE 



AND JOURNAL: 



COMPRERENDING 



THE VARIOUS BRANCHES OF SCIENCE, 



THE LIBERAL AND FINE ARTS, 



GEOLOGY, 



AGRICULTURE, 



MANUFACTURES AND COMMERCE. 



BY ALEXANDER TILLOCH, 



M.R.I.A. F.S.A. Edin, and Perth, &c. 



" Nee aranearum sane textus idco melior quia ex se fila gignunt, nee noster 

 vilior quia ex alie nis Hbam us ut apes." Just. Lips. Moult. J-'olii. lib. i. cap. i. 



{'i^:i0H 



^ilo^j^^^OL. XLVIir. 



For Jl'LY, AUGUST, SEPTEMBER, OCTOBER, NOVEMBER, 

 and DECEMBER, ^HlG. 



LONDON: 



fRlNXED BY RICHARD AND ARTHUR TAYLOR^ SHOE LANE: 



Alt' sold by Cadci.l and Das'ies ; Longman, Horst Rfes, Ormk, aiiJ 



Brows; Murray; Higulev; Sherwood and Co.; Harding ; 



UNniRwooD, London ; Co.nstable and Co. Tdinburj;!) : 



Bbasii and Rkid, and Niven, tilasjow: 



& Gilbert & Hocut^, Dublin. 



