1908] DORET Y—CERATOZAMIA 3k 
is sent to the first leaf (fig. 22). As previously noted, this organ, 
whether scale leaf or foliage leaf, is displaced laterally by the peculiar- 
ities of its development. All the ; ©p 
t i i likewise 
races which enter it are likewis Nas 
@), Om 
: 
distorted, giving rise to a pseudo- 
. J \ _4 
girdling condition which is appar- 
ent in very young seedlings (figs. 
22,27, 31). Thetwotraces which 
enter from the groups nearest the 
leaf (e, e’) take first a radial, and 
then a tangential course to reach 
4 position in the middle of the leaf 
(figs. 22, 31), showing on the way 
atendency tobranch. The traces 
(¢,d’) supplied from the groups 
farther away take a tangential ~ 
Course, each giving off vertical 
branches, which in turn branch 
again. The remaining traces of 
the original four foliar bundles 
ascend vertically (fig. 2 5), and 
branch and anastomose freely. 
Only a limited number, in most 
Cases four or five, remain (jb, jigs. 
24, 31). Before reaching the leaf 
base, each of these divides, one 
member entering it (¢, jig. 23), the 
other, which remains small, being 
directed toward the growing point 
of the stem (u, figs. 23,27). Fig. 
23 Tepresents the branching]and 
‘nastomosing of these strands. 
It should be noted that the vertical ) 
scale of the three diagrams (figs. Fic. 1.—Study of pO POG 
*1~23) is magnified considerably. () to apex (?); none oe 
In the younger stages there;is no attempt at girdlin . oe 
of the leaf traces, except that which has been referred to in 
