456 
Wernham, The Systematic Anatomy of the genus Canephora. 
occupy the centre of the transverse section, may probahly mark 
the Position of two large groups of thin-walled cells which have 
perished. 
A good deal of tannin is present, and a certain amount of 
calcium oxalate, which appears in a few of the cells in the form 
Fig. 3, a. 
of crystal sand. This sand displays a noticeable tendency to 
aggregate into amorphous clusters; and one or two ”cluster-crystals“ 
of typical appearance, but quite small, are to be seen. 
The xylem (xy) is very dense. The vessels are small and 
few in number; there are numerous fibres, with yery thick walls. 
