April 1817. 



No. 2g8. 



ss 



Published the Last Day of every Month, 

 [PRICE 2s. 6d.] . 



ii 



THE 



PHIlOSOPHieAL MAGAZINE 

 AND JOURNAL: 



COMFKEHENDIKG 



THE Various branches of science, 



THE LIBERAL AND FINE ARTS, 



GEOLOGY, 



AGRICULTURE, 



r.I ANUFA.CTURES AND COMMJERCE. 



NUMBER CCXXVill. 

 For JPRIL 1817. 



BY ALEXANDER TILLOCH, 



M.R.l.A. F.8.A. EDIN. AND PEUTH, ETC. 



.W\ LONDON: 



^SIm .printed by RiCHAan amd Arthur tayloh, shoe lAne; 



And sold by C A DELI, and Davibs; Lokoman^ Hurst, Rees, ' 

 OuME, & Browi); Murray; Highlet; SHER>vopb ahd Co.; 

 Hardino; Underwood; 8impkin and Marshall ; Lpndon: 

 Constable and Co. Edinburgh: Bhasb and Reid ; Dun- 

 cah; and Pem man, Glasgow: and Giibbrt and HodciIs, , 

 Dublin. " 



