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Hill and de Frame.- — On the 
(Series A-F) took place in exactly the same way as in Series A of P. in sign is } 
although the bifurcation of the phloem and rotation of the xylem occurred 
generally at a lower level in the cotyledons. The other seedlings showed 
certain variations which may be briefly alluded to. 
Series G. Of the four seed-leaves, three behaved in the same manner 
as in the preceding individuals (Series A-F) ; but the fourth seed-leaf 
showed no rearrangement of the vascular elements until entry into the 
hypocotyl had been made : then, the phloem divided into two portions 
which passed one on each side away from the xylem, and ultimately fused 
with the adjoining phloem masses derived from the other strands. The 
metaxylem similarly divided and moved to each side, leaving the proto- 
xylem exposed ; there was no definite rotation of the protoxylem, the 
bundle followed in the fashion usually associated with Juniperus. 
Series H. Here also, there were four seed-leaves, the bundles of three 
of which underwent the redistribution of the vascular tissues while still 
contained within the cotyledon. The strand of the fourth seed-leaf showed 
no such rearrangement to begin with, but at a slightly lower level signs of 
rotation of the xylem were seen, the movement, however, came to nothing, 
and the bundle finally behaved as a subsidiary structure. 
Series /. This seedling, in its essential features, recalled the changes 
described above for P. australis and P. insignis (Series B). The bundles of 
two of the cotyledons showed the divided phloem and exarch position 
of the protoxylem before the cotyledonary node was reached ; the vascular 
strands of the remaining two seed-leaves exhibited a similar rearrangement 
at a lower level within the hypocotyledonary axis. But the division of 
these two bundles was very unequal ; the two smaller neighbouring portions 
practically died out, and the two remaining parts together formed one pole 
of the triarch root (Figs, i and 2. PI. XV). The two seed-leaves from 
which these bundles were derived are thus to be looked upon as half- 
cotyledons. 
Series J . The four seed-leaves of this seedling were of unequal size, 
one (Diagram 5, Fig. 1 a) was larger than the rest, b was slightly smaller 
than a but larger than c and d, which were equal in size. The distal 
region of a showed two small bundles, the phloem masses of which fused at 
a lower level and, later, the xylem elements of each became joined by the 
formation of new metaxylem in the intervening space (Diagram 5, Fig. 2). 
At a much lower level this bundle underwent the usual bifurcation, and so 
also did the strand of the neighbouring seed-leaf b. In each case a resin 
duct occurred between the two separated portions of the bast. The traces 
of c and d showed no such division ; but, just above the cotyledonary node, 
they rotated slightly in such a manner that their protoxylems pointed 
towards one another. Further, c had no resin duct, this structure was, 
however, present in d and occurred on that side of the bundle towards e 
