132 BULLETIN OF THE 
(85, Plate I. Fig. 7); for the connecting thread in the dividing nucleus 
of Aphrophora remains unstained, and therefore contains no chromatin. 
The dividing nucleus represented by Figure 8 is peculiar in several 
respects. In the first place, the daughter nuclei are very unlike in 
form, though this is by no means unusual with dividing nuclei from old 
membranes. All the stainable nucleoli are in one daughter nucleus, 
while the other still shows a faint longitudinal arrangement of its 
chromatic threads. The sharply stained connecting thread is notched 
at a point midway between the daughter nuclei, probably indicating 
the place where, at a later stage, rapture would have occurred. The 
daughter nucleus on the left is nearly destitute of chromatin in the 
crescent-shaped space lying next the connecting thread, and an inner 
contour line is visible (x), from the central point of which a stainable 
cord extends to the proximal end of the connecting thread. I have seen 
a similar appearance in the late stages of other dividing nuclei, and it 
undoubtedly indicates the manner in which the daughter nuclei some- 
times attain a rounded form. Occasionally, however, daughter nuclei 
entirely separate from each other have a conical or tapered form. 
In the last stages of division, the connecting thread is drawn out to 
extreme tenuity (Figs. 9 and 10). So exceedingly fine does this thread 
become, that, with the highest power accessible to me (Zeiss’s homoge- 
neous immersion objective yg), I could barely trace its course through 
the cytoplasm, though in most cases I made out that it was continuous 
from nucleus to nucleus. It is finally broken at or near the centre, and 
the proximal tips, as Blochmann suggests, are probably absorbed by the 
daughter nuclei. In even so late a stage as that shown by Figure 10, 
the longitudinal chromatic filaments are still perceptible. The right- 
hand daughter nucleus contains four loop-shaped bodies that strongly 
resemble chromosomes. They are, however, almost unstained by hama- 
toxylin. 
Blochmann states (85, p. 482) that ın no case did he find a division 
of the cell following the division of the nucleus. As already said, the 
great proportion of binucleate cells renders it certain that cell division 
is not an immediate consequence of nuclear division. Although I have 
carefully examined great numbers of binucleate cells, I have only 
once seen a cell wall in process of formation (Fig. 27). Yet one finds 
plenty of evidence that cell division does take place. Pairs of cells like 
those in Figure 11 are of frequent occurrence. It is safe to infer, I 
think, from the arrangement of the binucleate cells which surround 
these, as well as from the correspondence in size and shape of this pair, 
