Vol. 55. March 1820. 



No: 96^ 



Published the Last Day of every Month, 

 [PRICE 2s. 6d.3 



THE 



PHILOSOPHICAL MAGAZINE 

 AND JOURNAL: 



,^^, COMPBBHSNDIMO 



Tf||;VARIOUS BRANCHES OP SCIENCE, 



THE LIBERAL AND FINE ARTS, 



GEOLOGY, 



AGRICULTURE, 



MANUFACTURES AND COMMERCE. 



NUMBER CCLXIIL 

 For MARCH 1820. 



WITH A PLATE BY PORTER 



Illustrative of Mr. Lane's Instrument for gathering: Fxuitj 



Mr. Young's Mode of preparing Opium from the Pataver 



samniferum; and^ Captain Forman's Essaj on a Property 



iu I/ight which hnRerto has been unobserved by Philosophers. 



Br ALEXANDER TILLOCH, 



M.R.I.A. l(.9.a. M.R.A.S. UUNrCH, f.S.A. EIMN. ANDPEUTK, &C 



LOND ON: 



FRIN'TED B7 RICUAR.D AND ARTHUR TAYLOR, SHOB-tANE : 



/Vnd sold Ujr Cadell and Daties ; Lqncman, HuIist, Re5s, 

 Orme, & Brown; Higkley; Sherwood and Co.; Harding; j 

 Undkrwood) SiMp^lNandMARtHALfc ; Londoo: Constable I 

 and Co. Edinburgh: Brash and Reid; Ddncan; and Pbk- 

 man, Glasgow : and Gilbert and Hodobs, Dablin'. 



