1888. } BOTANICAL GAZETTE. 313 
outer cylinder of collenchymatic cells; ¢, the inner, and d, 
the thin-walled chlorophyll-holding cells, which serve the 
purpose of assimilation, and also to separate the collenchy- 
matic tissue of the rind into the two cylinders. At each cor- 
ner, x v, the .ollenchymatic tissue extends through to the 
young phloem tissue. In the species and in the varieties 
bast cells are visible along the four corners. 
f the variety pur- 
section at 
si ‘dermis are in a state of rapid 
Silat jriecaeie 7 ig added to the outer cyl- 
4 
regard to the origin 0 ; : . f 
Bi also some see facts noted while making this study ; 
