2 54 
H. S. Holden. 
material obtained at Moorside, Oldham. As a consequence any 
conjecture as to the extent of the injury would he fruitless. 
The petiole, which is roughly pear-shaped in section, measures 
across its widest part fifteen millimetres by nine millimetres, and 
shows the typical Myeloxylon structure, possessing a fairly large 
pith surrounded by a series of vascular bundles and secretory canals 
and showing at the periphery the usual alternating hands of 
parenchyma and sclerenchyma with some traces of a more delicate 
external tissue. 
Fig. 17. Camera-lucida outline of petiole showing wounded area and 
general shape. The sclerenchymatous ribs are represented diagramatically 
and the vascular bundles and mucilage canals are omitted. 
The wound itself shows as a flat, or perhaps slightly incurved 
portion about four millimetres in extent, and is situated at one 
corner of the broader extremity. It occupies, roughly speaking, 
one ninth of the circumference of the petiole, and was therefore of 
not inconsiderable extent. It does not appear, however, to have 
been of a really severe nature, penetrating little below the fibrous 
strands of sclerenchyma and not encroaching upon the vascular 
structures, a feature in which it differs very considerably from the 
gaping wounds recorded by Stopes and Seward respectively. 
It is not at all likely that it was due to fungal agency, since 
there is not the slightest trace of any structure which could be 
construed in that light nor does the general appearance favour 
that idea. 
The great feature of interest, whatever the cause of injury, lies 
however, in the attempt at repair made by the tissue in the vicinity 
