192 C. CLIFFORD DOBELL. 
is from Gonder’s interpretation of them only that I am com- 
pelled to differ. 
I have found that when the animal is properly fig and 
stained, the nucleus invariably has the appearance shown in 
figs. 10 and 11. That is to say, it forms a complete net- 
work of chromatin and plastin, lying in the cell—just lke 
the nuclear net of Chromidina. The net is not always quite 
easy to make out in its entirety, owing to the manner in 
which the chromatin may be distributed in the plastin frame- 
work. Hence, when only a-.chromatin stain is employed, 
parts of the nucleus may appear detached (fig. 10). The size 
and complexity of the net vary a good deal. It often has a 
quite simple structure—especially in small individuals 
(figs. 12, 13). 
Just asin Chromidina the network remains as such 
during division. All stages, from the very beginning (fig. 
14) right up to the completion of the process of transverse 
division (fig. 15) are to be found. Division takes place rather 
rapidly—the organisms which I saw dividing taking about 
twenty minutes for the whole act. 
Here again, as in Chromidina, the organisms which con- 
tain lumps and scattered fragments of chromatin are produced 
by imperfect fixation. ‘The lumps appear as soon as the 
animals begin to die (figs. 17—19), and may take very 
different forms. ‘The degeneration is also seen, as a rule, in 
the cytoplasm, which becomes more coarsely alveolar. This 
was noticed by Gonder, though he failed to realise its meaning. 
“The alveolar system changes its character with the nuclear 
changes. If the nucleus is broken up or completely frag- 
mented—forming a chromidial apparatus—then the proto- 
plasm has a coarsely alveolar structure ” (p. 246). Gonder’s 
figures show this very accurately (e. g. figs. 19, 20, 26, etc.). 
A condition in which the chromatin is completely dissolved in 
the cytoplasm (Gonder’s fig. 19) has never come under my 
observation. It appears to me to be highly abnormal. 
Although I have examined a large number of individuals 
of all sizes, and at all different stages of division, I have 
