1899] THE COMPOUND OOSPHERE OF ALBUGO BLITI 167 
The nucleolus may travel poleward with one group of chro- 
mosomes, or break into two, either at this time or earlier, thus 
allowing a small nucleolus to go to either pole. It is easily dis- 
tinguished from the chromosomes by stain reaction and usually 
also by its size. At this stage there is at each apex a round 
body of the size and shape of the centrosomes, but scarcely dis 
tinguishable from the chromosomes except through position, 
Even in very late anaphase faint fibers may be seen connecting 
the daughter nuclei (jigs. 15, 16). When the chromosomes 
reach the end of the spindle they become indistinguishably min- 
gled and massed (fig. 76), but the nucleolus often stands out 
very distinctly by virtue of its color and size. 
fter the two groups of chromosomes are sufficiently sepa- 
rated the spindle fibers collapse in the middle ( fig. 78), and the 
daughter nuclei become distinctly organized. Each rounds off 
and contains a dark somewhat crescent-shaped mass of chroma- 
tin on the side that is turned away from its sister nucleus. This 
condition is often very noticeable in the differentiated oosphere 
when several daughter nuclei may be observed, each with its 
dark half centerward. The explanation of this condition is not 
far to seek, The sister nuclei lie in the periplasm with their 
red outward, plainly showing that the former 
€ lay across the line that separated the ooplasm 
of the oo: a These conditions present strong evidence 
ria of the nuclei in the oosphere. 
Sei Or not the centrosome of Albugo persists 8 per 
§an of the cell is a question that as yet is impossible 
ba th i The structure SO prominent at metaphase is not Been 
might ei . nucleus ; the conditions, however, are such that it 
Wnoticed . hidden among the chromatin granules and pass 
Negative a. So small and its stain reaction so uncertain that 
‘i shispe os valueless. eos 
the condit; ; € spindle figure may be greatly mo oe 
or example, if the nuclei happen to be in pro- 
hase when the centripetal rush of cytoplasm 
on due to the movement of the protoplasm seems 
Mitotic figur 
from the per 
to answer, 
re) 
Ons; 
or metap 
°CCUrs the tensj 
