

Vol: 55. 



April 1820. 



PI 



^^^^ PjtZ?/i5Aef/ ihe Last Day of every Months 



^1^ [PRICE 2s. 6d,] * 



THE 



PHILOSOPHICAL MAGAZINE 

 AND JOURNAL: 



COMPREHBHOIKO 



THE- VARIOUS BRANCHES OF SCIENCE, 



.y , THE LIBERAL AND FINE ARTS, 



GEOLOGY, 



AGRICULTURE, 



MANUFACTURES AND COMMERCE. 



•' T'l '-...:"-- ...:■'- .i.''-" "* " " 



ITTJMBER CGLXIV. 



For APRIL IS20. 



V/i TH A YLATE BY PORTER 



Descriptive of Mr. Cuthpert's improved HytIro^i>Beuinatic 

 Apparatus, fiic. _» 



|T_^ ill I !■»— . 





BY AhtXA'kDEn: TIL%&€yy 



M.R..T.A. M.G.S. M.R.A.S. MCSICII, f.S.A. KDIN. ANarr.l'.TU, &c; 



LOl^irO'N: ^ ; 



r.VlMtD BY RtCHAUD AND ARTHt'R TAYLOR, SHOE-LANE 



A»d sold By Cadell and Davies ; Long-man, Hurst, Kees, 

 OrmiB^IBc Brown ; Highley; SHERv/ooDandCo.iHARDiNG.'j 

 Ujjn|«wooD; SiMPKiNand Marshall ; London: Co">;' ■">• ri 

 an J Co. Edinburgh : Brash and Reid; Duncan;; 

 MAN, Glasgow:- and Gilbert and Hodges, Dubli 



