482 
Note . 
Two distinct abnormalities were presented by the specimen : 
1. A deviation from the normal longitudinal course of one of the leaf-trace 
bundles. 
2. A development of secondary vascular tissues in connexion with the displaced 
bundle resulting in the formation of a concentric bundle. 
1. A reference to the diagrams (Fig. 1) illustrating the series of sections taken 
through the length of the material under examination will show that one of the 
Fig. 2. 
bundles of the normal vascular ring, presumably a leaf-trace bundle, departs somewhat 
from the typical course. 
Instead of taking a vertical direction parallel to the neighbouring bundles, it 
passes obliquely downwards and inwards until it is in the pith, completely separated 
from and interior to the other vascular strands. 
How far this abnormal course is continued it is impossible to say, owing to the 
