470 
turn it round; and I find that in some plants of this species the 
upper section is dextrorsely spiral, and the lower section sinis- 
‘trorsely, whilst in other plants these relations are reversed. Thus 
we have didromy within each plant of Valisneria and antidromy 
between neighboring plants. 
It would be dangerous at this stage to attempt generalizations 
as to the cyptogams. I may be permitted, however, to call atten- 
tion to a few points. Inthe Atlases of Vegetable Palaeontology, 
by Schimper, Zeiler, Lesquereux and others, some of the figures 
of Carboniferous Acrogens, as Lepidodendron, Ulodendron, cones 
of Lepidostrobus, indicate a trend to one side which would indicate 
antidromy if others be found trending to the other side. The 
photograph of Lepidodendron lycopodioides in Plate LXX. of 
Zeiler's Atlas, does give a contrary spiral to that in Schimper’s 
plates, but Zeiler’s photograph may have been reversed in the 
process. The segments of apical cells of Hepaticae and Pterido- 
phytes seem to indicate in some cases a direct or ‘clock-wise’ 
order of appearance, and in other cases a reverse order ; but I do 
not know whether they may not vary in the same individual plant, 
or whether, on the other hand, they may not be homodromic in 
the totality of a species. I have been unable to find any variation 
of phyllotaxy in Lycopodium and allied forms, the great bilateral 
symmetry of the leafy axis obscuring the traces that might exist. 
But in two specimens of the tree-fern Alsophila the common 
phyllotaxy of 2 can be made out at the apex of the stem; in both 
our Princeton specimens the spirality is dextrorse (that is, after 
the course of the thread of a common screw). If anybody can 
produce a specimen with sinistrorse phyllotaxy, he will thereby 
furnish the lacking evidentiary fact, and complete the proof of 
the antidromy of the ferns. 
Botanical Notes. 
Two new botanical Serials. One of our esteemed contempo- 
raries has recently expressed some irritation on learning of the 
founding of a new serial publication. The number of opportuni- 
ties for the publication of botanical papers is indeed great, but the 
supply of matter evidently exceeds the space provided, for we 
