390 
MONTGOMERY. 
[Vol. XV. 
Wager (’93), nuclear division in Hymenomycetes agaricus: 
each nucleus of a basidium contains one large nucleolus, besides 
the nuclear network. The two nuclei of the basidium fuse 
together and form one nucleus, in which afterwards the two 
nucleoli later fuse to form one nucleolus. This latter is 
often vesicular in structure. In the mitosis it lies close to the 
nuclear membrane, it gradually loses its staining intensity, 
decreases in size, and finally disappears; at the same time the 
cytoplasm in its neighborhood stains more deeply. But some¬ 
times it persists until the diaster stage. “ From the fact that 
the chromosomes begin to stain red at the time of the disappear¬ 
ance of the nucleoli, it would further appear that the former 
can take up nucleolar substance from the nuclear sap, and as 
fast as the nucleoli disappear the chromatic elements become 
more deeply stained red.” In A. stercorarius , in the daughter- 
nucleus, “the chromatin mass appears to be transformed at 
once into the nucleolus,” and only later a chromatin network 
appears. “ I would suggest that the nuclear threads take up 
the dissolved nucleolar substance at some period during the 
division, and carry it over into the daughter-nuclei, to be given 
up again later as the nucleoli of the latter. . . . But a certain 
quantity of the dissolved nucleolar substance probably escapes 
into the cytoplasm when the nuclear membrane disappears, and 
this would be taken up at a later stage into the daughter-nuclei, 
as is shown by the increase in size of the nucleoli, and by the 
decrease in the capacity of the protoplasm for taking up stains.” 
Zacharias (’93) finds in plants that the nucleolus and cyto¬ 
plasm are erythrophilic, the nuclein (chromatin) network is 
cyanophilic. 
Belajeff (’94), “ Pollenmutterzellen ” of Larix: after the 
disappearance of the nuclear membrane in mitosis the nucleolus 
becomes gradually smaller and then disappears; several nucleoli 
reappear within each of the daughter-nuclei. “ Es ist zu 
bemerken, dass nach der Auflosung der Nucleolen der Mutter- 
zelle im Zellplasma eine gewisse Anzahl grober Kornchen 
erscheint, welche mit Safranin farbbar sind. Mit dem Beginn 
der Nucleolenbildung in den Tochterzellen verschwinden die 
Kornchen vollkommen. . . . Ich erklarte mir die Ergebnisse 
