450 Woodburn.—Spermatogenesis in 
of this vesicular structure is certainly the same as that of the vacuole 
just described in the preceding paragraph. In fact, I can see no reason for 
making a distinction between the two, except that the former (Figs. 1 6, 20, 
23, and 28) seems to represent a single large vacuole, while Figs. 21,25, 26, 
and 27 seem to represent a cluster of smaller ones. One characteristic 
of the latter should be mentioned which does not appear in the figures. 
There is a very decided contrast between the finely granular substance 
of the nuclear portion and the strands of this vesicle, which was very 
difficult to represent in the drawings. While these vesicular strands are 
very distinct, they do not stain like chromatin, and they have a lighter bluish 
appearance when compared with the darker richly staining substance of the 
part, which certainly contains chromatin. 
The Development and Nature of the Blepharoplast. 
While the general course of the development of this structure has been 
described, there are certain features which deserve special mention. Under 
certain conditions, doubtless of staining and fixation, possibly however due 
to different conditions of growth at the time of fixation, the distinction 
between the band or cord, which we have called the blepharoplast, and the 
nucleus can be traced to a much more advanced stage than is possible 
at other times. For instance, compare Fig. 16 with Fig. 21. In the 
former, although the body of the sperm has made slightly more than 
one complete turn, the blepharoplast cannot be distinguished, while in 
Fig. 21, which seems more nearly mature, a distinct cord is visible through¬ 
out the entire length. From Fig. 22 throughout the remaining stages 
represented, no cord distinct from the other material is evident. 
A majority of the figures of sperms have been drawn from what may 
be termed the side-view. Many sections were found presenting the sperm- 
cells to the observer from almost every conceivable angle. A number 
of these views are shown in Figs. 17, 18, 19, and 20. Observations of this 
sort bring out certain facts which are not otherwise evident. Fig. 17, 
which is drawn from a view-point on a radius passing through the blepharo¬ 
plast, shows the latter structure to be a relatively broad band passing 
between the observer and the nucleus. Fig. 18, which is more distinctly 
a surface view drawn from the same angle as Fig. 17 and representing 
a somewhat more advanced stage, shows a band considerably broader in 
proportion than that in Fig. 17 and with much denser contents along one side 
than the other. The nucleus is not shown in this figure. Figs. 19 and 20 
represent cross-sections through stages such as are shown by Figs. 16 and 
23. Both Figs. 19 and 20 had the stain quite well washed out, and they 
were also drawn rather lightly. The nucleus has apparently all collected 
along the blepharoplast, and the two are in cross-section indistinguishable. 
