




THE CYTOLOGY OF THE SUGARCANE 507 
the extreme right of the figure and one towards the right above the 
middle of the figure, this one lies at a lower level. 

Erie. 11. Bıe#12, 
Nucleus of a pollenmothercell of Nucleus of a pollenmothercell of 
EK 28 in diakinesis. x 2300. EK 28 in diakinesis. x 2300. 
Nuclei, like the one pictured, in which a similar large number of bi- 
valent chromosomes was visible occurred but sparingly among the 
preparations. Usually their number was smaller. Counts were possible 
in the case of several diakinesis-nuclei and these always pointed to- 
wards approximately 80 as the diploid number. 
In metaphases of the heterotype division, viewed from the side, the 
univalent chromosomes could always be easily distinguished from the 
bivalent ones by their form as well as by their size. That in the case of 
EK 28 also, irregular reduction can occur in embryosac-mother cells is 
shown by fig. 14. 
The smaller, approxi- © à 
mately round, univalent, ets Pis 
chromosomes are very oF ee ECD tel 
distinct from the larger, eck de 5, 
elongated, laced or dia- eee. à << FUR © 
mond-shaped, _ bivalent 
ones. © @ © 
In the anaphases uni- Fia. 13. 
valent chromosomes were Anaphase of the heterotype division of EK 26, 
. seen from one of the poles. x 3500. 
always seen, often in large 
numbers. Several times 79— 80 chromosomes were seen in this stage. 
Fig. 13 pictures an anaphase in which 80 chromosomes are clearly 
