AND SPECIES-HYBRIDS WITHIN THE GENUS SACCHARUM 289 
the right, it was however uncertain whether it really was a chromosome 
To emphasize the corresponding arrangement of the chromosomes, 
dotted lines are drawn. One sees, that chromosome a has no partner in 
the highest group, so that this is an univalent undivided chromosome, 
which is drawn, as a whole, towards the lower pole. The highest group 
contains 43, the lowest 44 chromosomes, between 3 or 4 unpaired ones 
are found; this points towards a diploid number of 90 or 91, while pro- 
bably in this nucleus 43 gemini and 4 or 5 univalent chromosomes are 
present. 
In fig. 81 the corresponding arrangement of the chromosomes in 
both anaphase-groups again is apparent. Chromosome 0 has no partner 
in the highest group. It is visible at a slightly higher level than the 
other chromosomes, possibly it is still in the aequator. The highest 
group contains 45, the lowest 46 chromosomes. It is not impossible 
that a very small number of chromosomes has been lying as single chro- 
mosomes in the aequator; in that case also the diploid number is to 
be fixed at 91. 

Fig. 82. 
Fig. 82. Anaphase of the heterotype division of Chunnee. The split, unpaired, 
chromosomes approach the poles x 2300. 
The corresponding arrangement of the chromosomes in both ana- 
phases almost excludes the making of a mistake in counting. Granting 
the possibility of a very small error, the diploid number can be either 
Genetica V 19 
