60 MR. R. H. COMPTON : AN INVESTIGATION OF THE 
one another in pairs and pass out without further change ; two long bands 
of phloem also enter each cotyledon. 
SOJA HISPIDA, Moench. 
The hypocotyl narrows gradually to the root. The cotyledons are ovate 
and rather fleshy. 
The root contains a solid tetrarch xylem star, which begins to contain a 
central pith just below the external collet. The pith dilates rather rapidly, 
so that about a quarter of the way up the hypocotyl the xylem is in four 
spreading groups, with protoxylem in the middle of each. Half-way up 
the hypocotyl the stele is somewhat elliptical and the two cotyledonary 
groups of bundles are now distinct : each comprises a polar triad consisting 
of a median protoxylem and a pair of rather widely separated metaxylem 
wings ; also two halves of the lateral xylems, each consisting of metaxylem 
with a protoxylem group attached to its extreme edge. The phloem is still 
in four groups which extend in ares between the ends of the major and 
minor axes. 
As we ascend above this level the polar protoxylems also divide, and tlie 
halves attach themselves to their respective metaxylems. — The lateral 
xylems fuse with the polar a few millimetres below the cotyledons ; so that 
the stele now contains only four broad bands of xylem, of loose texture, 
consisting chiefly of spiral elements, and having the vestiges of the root 
protoxylems attached to their edges. These xylem bands gradually become 
endarch, and by the time the cotyledonary node is reached they are typical 
stem-like collateral bundles, with hardly a trace of their hypocotyledonary 
nature. Each cotyledon takes two of these collateral bundles, the median 
line being devoid of vascular tissue. 
GLYCINE HISPIDA, Maxim. 
The dimensions of the seedling are somewhat larger than in that of 
Soja hispida, of which this species is supposed to be a cultivated variety. 
The transition phenomena are much alike in both species, but the changes 
occur at a lower level in Glycine hispida ; the transition being perhaps best 
classified as low, though it is not so low as in the Phaseolinz and Diocleinze 
to be deseribed below. 
PACHYRRHIZUS ANGULATUS, Ztich. 
The root is tetrarch, and the transition phenomena seem to be quite com- 
parable with those which occur in Clitorea Ternatea, for instance, though, 
as the germination is hypogeal, the changes in the hypocotyl are much 
compressed. 
