18 BOTANICAL GAZETTE | JANUARY 
The intercellular spaces ordinarily met with in such tissue are 
present, but there is no evidence of the existence of lacune. 
SCLERENCHYMA.—It has been shown already that the sub- 
cortical zone is 1.5™" thick. Within this region there are 
numerous oval or tangentially elongated bundles of sclerenchyma, 
which form long strands traversing the stem longitudinally for 
great distances (figs. 7, 2, and 3). These strands, which give 
the peculiarly striated appearance to the surface of the specimen 
wherever exposed, are always separated from one another by 
several large and thin walled parenchyma cells (fg. 7). which 
are seen to be very perfectly preserved in certain areas. The 
sclerenchymatous elements are always very thick walled in those 
strands which lie next the cortex (fig. 3), but become much 
thinner walled toward the center of the stem where they often 
appear to be ina formative condition. The strands are separated 
radially by rather wide areas of fundamental tissue (fig. 2), but 
in consequence of the general and great alteration in relative 
positions effected by compression, it is impossible to determine 
their original distribution. The radial distribution of these 
strands through a rather wide zone would seem to indicate that 
they may have been developed in more or less well defined con- 
centric layers, a relation which is certainly implied by their 
distribution within certain areas (fig. 2). Beyond a limit of 
1.5™" from the surface the development of the strands appears 
to be wholly arrested. 
VASCULAR BUNDLES.—The vascular bundles are not frequently 
represented, since in most cases they have been removed by 
decay, or other causes, and their former positions are then 
marked by the presence of rather broad, irregularly rounded 
openings of variable dimensions, which appear throughout the > 
transverse section ( figs. 7, 2, and 3), and particularly internal to 
the sclerenchyma zone. Occasionally the bundles are preserved 
in a very perfect manner, and exhibit all their essential structural 
features with great clearness (fig. 1). The outermost of the 
two bundles seen in fg. z, when much enlarged ( fig. ¢), is found 
to consist of several broad scalariform ducts enclosed on two 
