MITOSIS IX (EDOGONIUM 
149 
large number of preparations fails to show any evidence of a con- 
dition intermediate to those represented in figs. 16 and 17. The 
stages represented in these two figures were recognized, and their 
significance noted by Strasburger (loc. cit., figs. 57 and 59). 
The daughter nuclei are now definitely rounded off, and the 
nuclear contour reappears: from one to three nucleoli may now 
be seen (later always uniting into one) ; the moniliform chromo- 
somes have begun to pass over into a reticular structure which 
later becomes resolved into the discrete granules of chromatin 
characteristic of the resting nucleus; the mitosis is thus completed. 
Concurrently with these latest changes the transverse wall ap- 
pears in the plate of cytoplasm which now extends across the 
middle of the cell. 
The daughter nuclei at first lie close to the newly formed trans- 
verse wall: very shortly after they begin to migrate toward the 
future centers of their respective cells — a fact that was noted by 
Strasburger. The rate of movement does not appear to be the 
same in both cases, that in the more distally situated daughter 
cell apparently being the more active of the two; instances were 
not unfrequently found in which this nucleus had passed into the 
region of the ring before that structure had opened but a short 
distance, and while the companion nucleus was still in close prox- 
imity to the transverse wall. The migration of the daughter 
nuclei was noted and figured by Strasburger. 
SUMMARY 
Mitosis in CEdogonium resembles that seen in the higher plants 
in its essential features: the chromatin content of the nucleus be- 
comes aggregated to form a filament; this breaks into segments 
(chromosomes) which pass to the equator of the nucleus, there 
dividing longitudinally; the daughter chromosomes thus formed 
pass to the poles of the nucleus and there unite to form the daugh- 
ter nuclei. 
It differs from that ordinarily seen in the higher plants in the 
following features and their combination. 
