Liver 
1894. ] Notes on Dédoublement. 463 
the sidewalk. He very kindly placed this material at the dis- 
posal of the writer. The trees had recently been pruned, and 
the material in question consisted of the twigs which had fal- 
len into the street. It being early spring, only the leaf-scars 
remained to indicate the fallen leaves, but the scaly leaf buds 
were well shown. We will use the term leaves instead of 
leaf-scars. 
In the most interesting case the third node above the cut 
end of the twig showed a bud in the axil of the leaf, and a 
smaller one in the axil of the lowerstipule. Two leaves, each 
subtending a bud, occur after intervals of six, four, seven, six, 
and again of six nodes, in the last case the pair appearing just 
beside the terminal scar. There is herea sort of tendency to- 
wards the recurrence of dédoublement after an interval of 
about six nodes. 
On a second twig, one of the lowest nodes shows also a bud 
in the axil of a leaf and a second smaller bud in the axil of the 
lower stipule. At the fourth succeeding node the leaves are 
Opposite and do not maintain the usual lateral position of the : 
one half phyllotaxy, the pair having a diagonal position. 
Above this point every alternate leaf is separated by a shorter 3 
internode from the leaf below, so that the leaves have an war 
dent tendency to form decussating pairs. First are foun 
three pairs, of which the leaves are separated by shorter in- 
ternodes, then one pair of which the leaves are opposite, oe 
a pair of which the leaves are separated by shorter per fe 
and finally at the tip of the stem, a pair of leaves whic ae 
Opposite, and on each side of the terminal scar. The a is 
€ncy to form decussating pairs is here very marked, an 
fully successful at irregular intervals. : 
Ina third case, two leaves, each subtendi 
at the fifth node from the cut end, and also . 
ceeding node. Then two buds occur separated D. eae es 
Boies, and next are found two leaves subtending rf — 
bud placed in their conjoint axil. At the second axl ee 
this two leaves each subtending a bud occur. aati ee nied 
buds separated by shorter intervals, and next two he beds 
two buds, of which one is larger. After this come 
Presenting a sort of two-fifths phyllotaxy. 
_ On a fourth twig the second node bears ; 
Ing as a pair but a single bud. At the second n ; 
two leaves each subtending a bud; this recurs a 
ng a bud, occur 
the fourth suc- 
d by shorter in- 
two leaves subtend- 
ode above are 
he fifth suc- 
