342 
MONTGOMERY. 
[Vol. XV. 
“ Binnenkorper ” are not organs, since they show no fixed 
organic structure, but represent accumulations of various sub¬ 
stances. There is more nucleolar substance, “ Reservestoff,” 
accumulated in the nucleus before mitosis than is necessary 
for it, so that after a mitosis some always remains to serve for 
the production of daughter-nucleoli (this being an explanation 
for the reappearance of nucleoli after mitosis). 
Stauffacher (’93), maturation of the egg of Cyclas: the 
“ Urei ” contains a single large nucleolus ; later one or two 
“ Nebennucleoli ” also appear in the nucleus. When the ovum 
has so increased in size that it adheres to the wall of the ovary 
only by a narrow thread of cytoplasm, two nucleoli are present, 
which are of unequal size but are in close contact with each 
other; in one case the nucleolus was trilobular. After borax- 
carmine staining, the smaller one appeared more refractive and 
deeply stained than the larger. Subsequently the two became 
separated, and both vanished before the formation of the first 
pole spindle. 
Strasburger’s paper (’93) presents a general discussion of 
certain problems of mitosis in animals and plants; his 
remarks on the aequatorial plate are apropos here. He believes 
that the “Kornchen” found by Kostanecki (’92) in the equator 
of the central spindle are similar to, and comparable with, 
structures found by himself in the mitoses of plants, and are 
masses of nucleolar substance (these bodies being termed 
“ Centralspindelkorperchen ” by Kostanecki, “ Zwischenkor- 
per” by Flemming, and “ Zwischenkiigelchen ” by O. Hertwig, 
’92). “ Vergegenwartige ich mir nun das, was ich seinerzeit bei 
der Bildung pflanzlicher Zellplatten beobachtet habe \Histol. 
Beitr ., vol. i, p. 161 ], namlich das Fortschreiten jener tingir- 
baren Substanz, die ihrem Auftreten und ihren Tinctionen 
nach nur als Nucleolarsubstanz gelten konnte, zwischen den 
Verbindungsfaden bis zum Aequator, so muss in mir die Vor- 
stellung erwachen, dass es sich in der von v. Kostanecki 
geschilderten Erscheinung um einen entsprechenden Vorgang 
handle. . . . Mit den durchschnittenen [achromatischen] Ver¬ 
bindungsfaden . . . wanderte dann auch die Substanz der 
halbirten Zwischenkorper nach den Zellkernen zuriick, ahnlich, 
