An Abnormal Stem of Lonicera Periclymenum. 239 
Node 8 and onward (tenth and subsequent leaves). At the 
region of the tenth leaf a vascular strand appeared, for the first 
time, in the vertical ridge joining the leaves. This bundle continued 
up to the apex of the stem. From this point upward the structure, 
both at nodes and internodes, remained invariable. Thus the 
portion of the stem below this may be regarded as a transitional 
region from the ordinary stem structure. 
The following is the manner in which the ridge bundle was 
formed. The first or left lateral leaf trace, on leaving the central 
cylinder, took an oblique course upward and outward (Figs. VIII 
and IX). Whilst still in the cortex it was joined by the median 
leaf trace about the level at which the bud bundles arose from the 
stele (Fig. XI). The bundle formed by this fusion continued 
vertically upward through the outer ridged region of the cortex 
and part left the stem, as the bundle of the leaf, at a slightly higher 
level. The remainder of the strand continued upward in the ridge 
and was joined by the second or right lateral leaf trace. The ridge 
bundle then passed upward through the internode and was 
subsequently joined by the three traces to the next leaf. 
The same type of structure was found in all leaves at higher 
regions of the stem. 
The three strands to each leaf passed out from the stele at 
different levels and took part in the formation of the ridge strand, 
which was continuous through nodes and internodes (Fig. XII). 
A single bundle was given off from this to each leaf. 
The bundles to the bud arose just above the point of origin of 
the median leaf trace, and slightly above this the tissue to the leaf 
left that of the ridge. 
Summary. 
The abnormal specimen of Lonicera Periclymenum bore leaves 
singly at each node. These were obliquely inserted, and all arose 
from the same side of the stem (Figs. II and III). The buds 
showed lateral and downward displacement, being situated on the 
left side of their respective leaves. 
A vertical ridge passed down one side of the stem connecting 
the leaf bases (Fig. III). The stem showed spiral striations. 
A cylindrical stele traversed the stem from end to end. From 
this, three vascular strands, situated vertically above one another, 
passed out obliquely at every node. 
These united with and formed part of a vertical bundle 
traversing the centre of the interpetiolar ridge (Fig. XII). 
