À CYTOLOGICAL INVESTIGATION OF SOME SPECIES AND 
SPECIES-HYBRIDS OF THE GENUS SACCHARUM 
by Dr. G. BREMER 
IT 
(Continued from p. 148) 
Nine counts of diakinesis-nuclei of F idji gave three times 39 chromo- 
somes, twice I hesitated between 39 and 40, while four times forty were 
counted. The nuclei of this kind frequently were unclear, in the case 
of the nucleus of fig. 50 the number 40 was quite certain. In the nuclear 
plates of Frd7r, the chromosomes are lying close together. Although this 
makes counting difficult, a number of nuclear plates can be found in 
which the number of chromosomes can be determined with certainty. 
In the nuclear plate of fig. 50 the number is doubtless 40. 
“ In 16 cases counted, 11 gave 40 chromosomes, 2 gave rise to hesita- 
tion between 39 and 40, 2 gave 41 and one hesitation between 41 and 
42. Doubtless the correct haploid number is 40 for Fidji also. The num- 
bers 41 and 42 may be caused by a mistake in counting, probably ho- 
wever, here also, univalent chromosomes are the cause, because during 
anaphase these sometimes lag behind in the aequatorial plane. Just as in 
thecase of Ardjoeno, here also, chromosomessometimes remain unpaired. 
The reduction-division of Batjan-cane. 
The diakinesis-nuclei of Batjan-cane are frequently not very distinct. 
This is caused by the fact that the nucleolus always retains the black- 
_blue haematoxyline-color and therefore frequently hides chromosomes 
from view, while often small nucleoli, as described in the case of Fidji- 
cane, occur. 
In fig. 53 a diakinesis-nucleus is pictured in which 40 chromatine- 
elements could be dinstinguished. In 13 diakinesis-counts the numbers 
found, differed from 37 to 41. The images of the nuclear plates also 
Genetica V 18 
