39S MONTGOMERY. [Vol. XV. 



Kernkorperchens . . . spricht entschieden fur Strasburgers 

 Annahme, dass es zur Bildung der Spindelfasern benutzt 

 werde." 



Harper ('97), ascus of Erysiphe : the nucleolus and the cen- 

 trosphere stain in the same way, and " die achromatischen 

 Fasern, auswelchen diese intranuclearen Strahlenkegel gebildet 

 werden, entstehen wahrscheinlich grosstentheils auf Kosten 

 der Kernkorperchensubstanz, die zu dieser Zeit regelmassig 

 verschwindet." 



Huie ('97), cells of Drosera : the nucleoli (" nucleolar chromo- 

 somes ") are spherical and usually central; "endonucleoli " 

 are enclosed spaces, not granules. During the process of food 

 assimilation by the nucleus the nucleolus becomes smaller, and 

 its vacuoles less apparent. 



Lidforss ('97) gives a thorough review of the " Sichelstadium " 

 (Strasburger's " Sekretkorperchen ") of the nucleolus in plant 

 cells, as also the results of observations of his own on the 

 embryo sac. Tulipa : at first there are several small nucleoli 

 within the nuclear cavity, which later by their fusion produce 

 a large one which becomes flattened against the nuclear mem- 

 brane (the process is essentially the same in Fritillaria, Anthe- 

 riaim, and Liliiitu). Gagea : the nucleolar changes are as in 

 the preceding forms, except that when the nucleolus reaches 

 the periphery it remains spherical ; this is also the case in 

 Ornitliogaliim. Oenothera : in the youngest cells there is one 

 central nucleolus ; subsequently this flattens against the nuclear 

 membrane, but finally wanders back to the center and becomes 

 spherical. He concludes that in the angiosperms the sickle 

 stage of the nucleolus is a normal phenomenon, as is also its 

 excentric position. In male and female germ cells these meta- 

 morphoses occur at corresponding stages, namely, when the 

 reduction of the chromatin takes place ; " indessen bleiben 

 vorlaufig alle Speculationen iiber die Bedeutung des Sichel- 

 stadiums von problematischen Werth. . . ." 



Mottier ('97), cells of Podophyllum and Lilium : in mitosis, 

 at the time of disappearance of the nuclear membrane, the 

 nucleolus breaks into fragments of various size. " Bei der 

 Anlage der vielpoligen Spindel nun treten im Cytoplasma 



