1898 - 99 .] Edith Chick on Bicinus Communis. 
657 
various specimens is similar; differences occur in some minor 
details. 
In the specimen chosen for description, while the hypocotyl was 
fully elongated, the epicotyl had reached a length of less than 
2 cm., two internodes only being visible. 
The dimensions were as follows : — tap root, 7 cm. ; hypocotyl, 
19 ‘5 cm. ; first internode, 1*5 cm.; second internode, -2 cm. 
At the base of the hypocotyl there was a broad active band of 
interfascicular cambium, giving rise to secondary xylem and phloem 
elements at various points in its circumference. At a distance of 
two or three centimetres from the 1 collet 5 these secondary 
structures were no longer met with, although the cambium ring 
was still broad. From this level upwards, the cambium ring 
became gradually narrower, and at about 18 cm. from the collet 
it had almost disappeared. 
In this specimen, also, it was possible to follow the change of 
the same layer of cells from the endodermis of the root to the 
starch sheath of the hypocotyl. 
The layer retained its endodermal characters, i.e ., its thickened 
radial walls, for nearly 2 cm. in the hypocotyl, and then, with the 
appearance of starch, at first in small and higher up in larger 
quantities, took on the characteristics of a typical starch sheath. 
Branching op the Eight Bundles. 
In this specimen, at 13 cm. from the collet, the first signs of 
branching appeared. In four out of the eight bundles (fig. 10 — 1, 
4, 5, 8, i.e., those next the longitudinal plane perpendicular to 
the plane passing through the .cotyledons), the phloem becomes 
divided to three ; one central large mass, and one smaller one on 
either side. 
The lateral phloem masses leave the central one ; immediately 
afterwards lateral portions of the xylem also break away, and two 
lateral branch bundles are completely separated from the central 
one (fig. 11). 
In the remaining four bundles (fig. 10 — 2, 3, 6, 7), a similar 
branching takes place on one side only of each ; there is, there- 
fore, a gap left between bundles 2 and 3 and 6 and 7. Thus 
