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[Vol. XV. 
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Kernfaden, kyanophil”; these disappear before the mitosis, 
while the Eunucleoli remain until about the end of the spirem 
stage. Vacuoles arise only in the Eunucleoli. 
Rosen in a second paper (’92b) presents further observations 
upon nucleoli. Myxomycetes: the spore nucleus contains one 
large nucleolus. Fuligo septa , plasmodium : one large, cyano- 
philic nucleolus, which he terms “ Mittelkorperchen,” since in 
the atypical mitosis this body lies in the middle of the pole 
plate, and disappears at the end of the nuclear division. Syn- 
chrytrium: one large nucleolus with several vacuoles ; in the 
first mitosis the division of this nucleolus precedes that of 
the nucleus, but during subsequent divisions the nucleoli 
vanish. In Cystopus there is no nucleolus. 
Schottlander (’92), cells of cryptogams : the nucleus consists of 
a blue-staining substance (network), and a red-staining (nuclear 
membrane, nucleoli). Egg cell of Gymnogramme chrysophylla : 
here are one or several large nucleoli, each surrounded by a 
vacuole; in the ripe egg the nucleoli are filled with small glob¬ 
ules. Egg cell of Chara: the nucleoli contain vacuoles, which 
later become so large in the largest nucleoli that they become 
polygonally flattened against one another, and their thin walls 
then present the appearance of a network within the nucleolus. 
Demoor (’93), mitosis of Tradescantia: the nucleoli gradually 
disappear during the prophase. 
Gjurasin (’93) investigated the nuclear division of Peziza. 
In the nucleus is one large, excentric nucleolus, which stains 
red with Flemming’s triple stain, while in it as many as six 
granules may occur, and these stain violet. In the mitosis 
these granules disappear, but otherwise the nucleolus does not 
change at first, but occupies its original position within the cell, 
though now in the cytoplasm; eventually it disappears gradually. 
In each daughter-nucleus a new nucleolus arises, which appar¬ 
ently has no genetic connection with the mother-nucleolus (now 
vanished). “ Ich bin der Ansicht, dass . . . das Kernkorper- 
chen nicht eine Art von Reservestoff darstellt, sondern ein 
specifisches Organ des Zellkernes ist.” 
Karsten (’93), nuclear division of Psilotum : in the resting 
nucleus are two or three nucleoli, which are homogeneous, oval 
