■with, of the plan on which Exogenous trunks are formed. 

 This is easily seen by taking an old stem of Pereskia acu- 

 leata, and macerating it for a few weeks, when the whole of 

 the horizontal cellular system decays, leaving behind it the 

 longitudinal system in the form of a woody skeleton. 



The drawing was communicated in October 1833, from 

 the Garden of W. M. Christy, Esq. of the Clapham Road, 

 by his intelligent gardener, Mr. James Nash. 



