102 A CYTOLOGICAL INVESTIGATION OF SOME SPECIES 
chromosomenumbers of Carex are 8 in the case of C. pilulifera, 16 in 
that of C.[ericetorum, 24 in that of C. digitata, while C. caryophyllea and 
flava both have 32 chromosomes in their gametes. STOUT gives 37 as the 
haploid chromosome-number of C. aguatilis and JUEL 52 as that of C. 
acuta. 
In the case of the edible pisang or banana TISCHLER !) found diffe- 
rent chromosome-numbers among the different races, to wit in the case 
of Dole” 8, in that of , Radjah Siam”’ 16, in that of „Kladi”’ 24 chromo- 
somes in the gametophyte, while DD ANGREMOND ?) found in the , Apple- 
bacove” 11—12 and in, Gros-Michel’ 16, both, also being banana-races. 
The present investigation will show that Saccharum officinarum and 
S. spontaneum differ in chromosome-number, and that varieties belon- 
ging to these species have the same chromosomenumber as the types, 
while the morphologically different canes Chunnee and Ruckree have 
the same number of chromosomes but a number differing both from 
that of S. officinarum and from that of S. spontaneum. 
There exist already two articles on the number of chromosomes with- | 
in the genus Saccharum neither of which can be harmonised with each 
other nor with my own results. FRANCK 3) found in the case of Saccha- 
rum officinarum 14 as the haploid and 28 as the diploid number and 
Kuwapaf) mentions 68 chromosomes in the diplonts both of S. offici- 
narum and S. spontaneum. d 
Something will also be said about a preliminary investigation of the 
cytology of some hybrid individuals from crosses of Saccharum offici- 
narum and S. spontaneum. 
CHAPTER I 
MATERIAL AND METHOD 
As the number of chromosomes is very high in all cases in which spe- 
1) G. TISCHLER, Untersuchungen ueber die Entwicklung des Bananen-Pollens. 
Arch. f. Zellforschung V. 910. 
?) A. D’ANGREMOND, Parthenocarpie und Samenbildung bei Bananen. Flora 
107. 1915, p. 57—110. 
*) W. J. FRANCK, Somatische kern- en celdeeling en microsporogenese bij het 
suikerriet. Diss. 1911. 
4) YOSHINARI Kuwapa, Ueber die Chromosomenzahl van Zea Mays L. Botani- 
cal Magazine Tokyo. Vol. XXIX. 1915, p. 87. 
