KARYOKINESIS AND ITS RELATION TO FERTILIZATION. 211 
Leydig (126), and others. Flemming has proposed for it the 
terms “ Filarmasse”’ or “ Mitom,’”’ Hanstein and Strasburger 
would speak of it as “ Cytohyaloplasma,” and Leydig as ‘‘ Sub- 
stantia opaca.”’ 
Kupffer’s “ paraplasma ”’ comprises the more fluid substance 
of the cell-body, which fills up the spaces between the network 
of the protoplasm (Mitom); its synonyms are “ Interfilarmasse,”’ 
or ‘‘ Paramitom ” (Flemming), ‘‘Substantia hyalina” (Leydig), 
“Cytochylema” (Strasburger). The last, however, distin- 
guishes in cytochylema two different constituents, ‘ plasmo- 
chym” and “cytochym,” since he understands by ‘ plasmo- 
chym” the thick fluid albuminous substance of the cell-body, 
and by “‘ cytochym ”’ the more watery sap, which is present in 
the so-called vacuoles of plant-cells. 
We have already mentioned the usual names for the consti- 
tuents of the nucleus. In reference to Strasburger’s nomen- 
clature it must be added that he calls the nuclear network 
(Geriist) by the name of “ Kernprotoplasma,” or ‘ Nucleo- 
plasma.”’ It consists of a hyaline ground substance, ‘ nucleo- 
hyaloplasma,” with the Balbiani-Pfitzner chromatin spherules 
embedded in it, which, as mentioned above, are called by 
Strasburger “Nucleo-mikrosomes.” To the nuclear sap (Kern- 
saft) which fills the spaces in the Nucleohyaloplasm he gives 
the name ‘ Nucleochylema.” When, as is often the case, 
mikrosomes are present in the thread-network of cyto- 
hyaloplasm, these would be named “ cyto-mikrosomes.” 
With reference to the name “ Mitom,” Flemming has pro- 
posed the name ‘‘ Karyomitosis ” for Schleicher’s term “ Karyo- 
kinesis,” as we mentioned at the beginning. By the name 
“ Kernspindel” Flemming and Pfitzner mean the achromatic 
spindle figure, which Strasburger in his recent work (191) 
adopts. The ‘ Kernplatte”’ is Strasburger’s name for the 
mother-star arrangement of chromatic threads (vy. fig. 7). 
Strasburger prefers to use the name “ Kernplatte” instead of 
Flemming’s ‘‘ Monaster ” or “ Mutterstern”’ (mother-star), for 
the condition seen in plants, since there is frequently no dis- 
tinct star arrangement, but in the middle of the so-called star 
