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. 
