$34 A CYTOLOGICAL INVESTIGATION OF SOME SPECIES 
„in such a way that its bivalent nature can not be seen in the drawing; 
under the microscope its bivalency however could clearly be made out. 
On looking at the nuclear plates of Avdjoeno from the side, it beco- 
mes apparant that the chromosomes are less regularly situated in one 
plane than those of glagah. The gemini are in part very short and dia- 
mond-shaped, in part somewhat longer and laced. The latter cases 

° fig. 27; Fig. 28. 
Fig. 27. Diakinesis of Ardjoeno x 2300. 
Fig. 28. Metaphase of the heterotype division of Ardjoeno viewed from the side 
x 2300. 
show a stage when the chromosomes begin to part. Nearly always this 
has even happened already in the case of some of the gemini. Fig. 28 
gives a picture of such a nuclear plate. In this case also an accurate 
count was impossible. 
As a consequence of the fact that the gemini in the nuclear plate do 
not liberate the constituting chromosomes simultaneously, it is impos- 
sible to find nuclear plates in polar view in which the chromosomes are 
