142 Jeffrey. — Infranodal Organs in 
cylinder which has been deprived of its cortex and phloem 
by maceration. The cylinder has been split and the two 
halves placed side by side. A row of lenticular cavities may 
be seen crossing the axis, each of which subtends a leaf-trace. 
In Photograph 9, PI. IX, is represented a radial section 
passing through one of the parenchymatous organs. Above, 
on the left, is the medullary diaphragm. Passing obliquely 
outwards is a leaf-trace which originates from the lower node 
and passes upwards, opposite the secondary wood, to make 
its exit just below the higher node. This photograph shows 
clearly that the parenchymatous organs under discussion are 
really the upper ends of the foliar lacunae, and at the same 
time are infranodal. 
Photograph 10, PI. IX, is of a transverse section of the 
stem of Cornus stolonifera at the height of exit of the leaf- 
traces. The parenchymatous gaps are six in number in this 
case, three for each leaf. The lacunae are here very small 
in size, as is usually the case with plants with more slender 
stems and denser texture than those described in former 
paragraphs. In Photograph 10, PI. IX. the same stem is 
shown in transverse section at a region considerably below 
the node, and indentations may be seen in the woody zone 
corresponding to the leaf-traces. Photograph 12, PI. IX, 
shows the same stem at a point just above the region where 
the woody cylinder is interrupted by the exit into the cortex 
of the leaf-traces of the next lower phytomere. The foliar 
indentations in the woody cylinder have disappeared. This 
section is to be regarded as passing through the nodal region ; 
for just above it the leaf-traces begin their upward and 
outward course in the secondary wood, which is only com- 
pleted immediately below the next node. The gaps in the 
woody cylinder in this case also correspond to the outgoing 
leaf-traces, and are likewise below the node. 
The writer has made similar observations in a number of 
other cases, and it appears to be not uncommon in plants 
possessing secondary growth that the leaf-traces should pass 
upwards in the secondary wood, and outwards into the cortex 
