Wound healing in a species of Oak. 
7 
SOME OBSERVATIONS ON WOUND HEALING IN A 
SPECIES OF OAK. 
By A. V. Duthie. 
[With Plate II and Three Text-Figs.] 
1 1HE slab of oak under consideration was sent to Professor 
Seward by Mr. Sindall of Cambridge. The wood is stated to 
be Austrian oak and from its general appearance and structure 
probably belongs to the species Q. pedunculata. Assuming that a 
single ring was produced each year the trunk must have been 160 
years old when felled, with a diameter of 37cm. The ten outer 
rings, which belong to the sap-wood, are much lighter in colour than 
the heart-wood, and the limit between the two is made still more 
evident to the naked eye by a dark brown border due to the presence 
of tanniniferous contents in the cells of the wood-parenchyma and 
medullary rays (Plate II, Figs. 1 and 2). 
Text-Fig. 1. Outer jagged end of embedded deal peg showing occluding 
callus layers. 
The tree from which the slab was sawn received numerous 
wounds at different periods of its growth. The most striking of 
these is due to the insertion of a deal peg when the tree was 112 
