246 Browne.—A Second Contribution to our Knowledge of the 
young Cone A the reflection, supposing it to have begun, can only have 
been incipient, and yet the traces of the three lower series, Series A, B, and 
C, showed an average downward divergence. It is true that this was 
inconsiderable in Series B and C, in which some of the traces even diverged 
upwards (cf. Text-fig. 3); but in Series A all the traces diverged down¬ 
wards, and the average extent of the downward sweep was 312 /u, which, 
though it may seem a small actual distance, gives a steep angle (cf. Text-fig. 2). 
It is, however, clear that the lower internodes of Cone A have already 
elongated considerably. It seems likely, from the course of the traces, that 
c. j-e 
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11 . 12 . 
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Fl i 
Text-fig. 3 . Divergence of traces of Series B of Cone A. x 13 ^. Lettering as in Text-fig. 1 . 
this elongation has been greater in the inner part of the stem, i. e. at the 
stele, than at the exterior where the sporangiophores are inserted ; in this 
case the point of insertion of the trace on the stele would come to occupy 
a higher level than the point at which the trace leaves the stem. This 
greater elongation of the internode in the inner part of the stem might 
account for those exceptional cases in which the inner part of the course of 
the traces is steeper than the outer. The elongation of the internode is 
much less as we pass upwards; for instance, even in the young Cone A it 
is much less considerable above Series B than above Series A. In the 
upper part of the cone such elongation as has taken place in the stele does 
not apparently exceed that which has occurred at the periphery of the 
stem. Among the species the cones of which I have examined, viz. 
E. arvense , E. palustre , E. limosum , and E. maximum , the last is the only 
