Vol 



^ TuBishld tJte Last Day of every Month, 

 [PRICE 25. 6J.] 



THE 



PHILOSOPHICAL MAGAZINE 

 AND JOURNAL: 



COMPKEHENDINO 



THE VARIOUS BRANCHES OF SCIENCE, 

 THE LIBERAL AND FINE ARTS, 

 GEOLOGY, 

 AGRICULTURE, 



MANUFACTURES AND COMMERCB. 



NUMBER CCLXVII. 

 For JULY 1820. 



WITH A PLATE BY PORTER 



Illustrative of Mrs. Ibbetson's Paper on the Physiology of 



Botany. 



BY ALEXANDER TILLOCH, 



M.R.I.A.M.G^. M.K.A.S. MUNICH, F.8.A. EDIN. ANDPEUTII, 

 M S.E.I.N. OF IRAl.CE, &C,.&U &C. 



LONDON: 



■ PRISTED BY RICHARD AND ARTHUR TAYLOR, SHOE-lANE : 



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