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MONTGOMERY. 
[Vol. XV. 
Jodgrun tingirten Schnitten werden die Paranucleolen weder 
reinroth wie die Nucleolen, noch blaugriin wie die chromatische 
Substanz gefarbt, vielmehr nehmen sie eine Zwischennuance, 
welche mehr der des Chromatins als der der Nucleolen ahnelt, 
an”; he believes these paranucleoli to be artefacts. In con¬ 
tradiction to Karsten (-93) he found no body in Psilotum 
comparable to a Nucleo-Centrosoma. 
Zacharias (’94) concludes, from numerous observations on 
cells of plants that as the size of the nucleus increases (or 
decreases) with the size of the cell, so also that of the nucleolus 
increases (or decreases) with the size of the nucleus. 
In Rosen’s (’95) contribution a large number of new facts 
are recorded, which may be briefly mentioned. The kyanophilic 
nucleoli of Auerbach “ sind eben keine Nucleolen und bediirfen 
als wenig constante Theile des Chromatingeriistes iiberhaupt 
keines besonderen Namens.” Hyacinthus: in meristem nuclei 
all the nucleoli except the smallest lie in special clear spaces, 
and though fibrils are rarely found in connection with them, 
“gleichwohl muss das Kernkorperchen in seiner scheinbar 
schwebenden Lage wohlbefestigt sein, da es . . . stets seine 
Lage im Centrum seines Hofes bewahrt.” The large nucleoli 
of the “ Gefasszellen ” become vacuolar as they increase in size. 
In mitosis of root cells the nucleoli become gradually dissolved 
within the nucleus in some species, in others they are extruded 
into the cytoplasm; in the latter cases “ erfolgte die Zerkliiftung 
und Auflosung des Nucleolus viel langsamer, sodass bei dem 
Schwinden der Kernmembran noch bedeutende Nucleolarreste 
vorhanden waren.” The nucleoli reappear in the dispirem 
stage before the daughter-nuclei have produced membranes, 
and the new nucleoli stain from the commencement intensely; 
from which the general conclusions are drawn : in the prophase 
the diminishing nucleolar substance penetrates, perhaps as a 
micellar solution, into the cytoplasm, and this process may 
cease before the nuclear membrane has disappeared. In some 
cases larger particles of nucleolar substance may penetrate 
into the cytoplasm, but only after the nuclear membrane has 
disappeared, and these particles become subsequently dissolved 
in the cytoplasm; in either case “ das losende Agens muss wohl 
