THE 



PHILOSOPHICAL MAGAZINE: 



COMPREHENDING 



THE VARIOUS BRANCHES OF SCIENCE^, 



THE LIBERAL AND FINE ARTS, 



AGRICULTURE, MANUFACTURES, 



AND 



COMMERCE. 



BY ALEXANDER TILLOCH, 



HOKOKAEY MEMBEE OF THE ROYAL IRISH ACADEMY, &C. ScC, &C. 



" Nec aranearum sane textus ideo melior quia ex se fila gig;nijnt, nee noster 

 vilior quia ex alicnis libamus ut apes." Just. Lips. Monit. Pcllt. lib. i. cap, i. 



VOL. XVIII. 



LONDON: ——--•■ 



Printed for Alexander Tilloch, 



Jiy y. Taylor, Blaci- Horse-Court, Fleet-street: 



And sold by Messrs. Richardson, Cornhill ; Cadell and Davies, Strand; 



Longman and Rees, Pater-noster Row; Debrett, Piccadilly j 



Murray, rieet-strect ; Symonds, Pater-noster Row; 



££LL, Oxford-street; Vernor and Hood, 



Poultry; Harding, St. James' s-street ; 



Bell and Bradfute, Edinburgh; 



Brash and Reid, Glasgow; 



and Gilbert and Hoogesi 



Dublin. 



