3 H 
Hill and de Fraine.—On the 
The appearance of the bundle throughout the greater length of the hypo- 
cotyl is represented in Diagram 3, Fig. 5. The foot, which is situated in 
the cotyledonary plane, although relatively large, has no vascular supply ; 
Diagram 3 . Welwitschia. 
but the two bundles on that side of the axis gradually curve outwards 
towards it, and, when immediately opposite, increase in size. This increase 
is especially noticeable in the xylem, which, in area, is about twice as exten¬ 
sive as the same tissue of the bundles distal to the foot, but at the same 
level. 
