io Seward . — On the genus Myeloxylon ( Brong .). 
present close to the bundles. The longitudinal sections of the 
same specimen throw little light upon structural details : the 
tracheids appear to be scalariform, reticulate, and spiral. 
The smaller fragment seen in longitudinal section in Fig. 3 
shows, in transverse section, certain characters which are 
apparently absent in the larger section. In Fig. 9 one of the 
best bundles is figured ; the structure is clearly collateral, and 
the xylem has not been displaced as in the bundles of the 
larger fragment. Here also we find smaller tracheids on the 
side of the phloem-space, which I am inclined to regard as 
protoxylem. Surrounding the bundles are smaller parenchy- 
matous cells, with here and there thick-walled mechanical 
elements. In the same figure is shown a canal with a dark- 
coloured substance in its cavity, probably the remains of the 
original secretion. Several of these canals are represented in 
Fig. 10, the narrow cells surrounding the cavities being well 
shown ; in this section we see indications of the characteristic 
radial groups of hypodermal tissue. Some of the thick-walled 
hypodermal cells are seen in longitudinal section in Fig. 1 1 at a\ 
next to these are thin-walled and less elongated parenchymatous 
cells : at d the tissue is badly preserved, but probably we have 
here the remains of a group of thick-walled hypodermal cells. 
Passing farther along the section, we come to the paren- 
chyma of the ground-tissue, the cells of which are somewhat 
elongated and arranged in rows. In the canal, cut longi- 
tudinally, the contents appear to be divided up into detached 
pieces by thin transverse septa : an examination of these 
canals under a higher power led me to doubt the existence 
of the septa and to attribute the present form of the contents 
to shrinkage. By comparing the transverse and longitudinal 
sections of the canals we see how the contents have contracted 
both transversely and longitudinally. 
Part of a canal is represented in Fig. 12 under a higher 
power ; in this figure the darker lines bb correspond to the 
walls b next to the canal-cavity in Fig. 10: the limiting lines 
cc of the dark-coloured contents in Fig. 12 are seen at c in 
Fig. 10. 
