498 THE CYTOLOGY OF THE SUGARCANE 
The investigation, reported in the first part, taught us consequently, 
that the original forms of Saccharum have different chromosome-numbers, 
a fact of importance for the division of that genus into species. It re- 
sulted further, that the chromosome numbers of the hybrids between S. 
officinarum and S. spontaneum were connected, in a very peculiar way, 
with the chromosome-numbers of their parents. This latter result con- 
sequently opens the way to learn, by means of cytological investiga- 
tion, something of the way in which the different kinds of sugar cane 
have descended from these species or, possibly, from others. 
In this second part, the cytology of some cultivated kinds of sugar- 
cane shall be considered. Of a number of these the origin is not known 
with any degree of certainty. Judging by the results described in the 
first part, it might be assumed that a cytological investigation of them 
would throw light on their origin. Of those cultivated kinds, the pa- 
rents of which were known, it was also interesting to learn — in con- 
nection with the crossing-problem — how their chromosome numbers 
were related to those of their parents, if only to test, by means of 
them, the results at which we had previously arrived. 
We will now, first, consider what is known about the origin of some 
cultivated kinds of sugarcane. 
One of the parents of the sugarcane 247 B, obtained by BOURICIUS 
‘at some time about 1894, is doubtless the Fidji-cane, which 247 B re- 
sembles greatly phaenotypically; the other parent is unknown !). The 
sugarcane 100 POJ has been obtained by WAKKER in 1873 from an in- 
florescence of Bandjarmassin hitam pollinated by the wind. 
„As to the father of 100 POJ, we are entirely in the dark, but jud- 
ging from the sprouting of its cuttings, from the way in which the hairs 
are arranged on the leafsheaths, from the way in which the internodes 
colour and from the colour of the leaf-crown it may be assumed, that 
Loethers-cane was the father” 2). 
The sugarcanes EK 1—EK 6, inclusive, of which EK 2 is the most 
important one, have been obtained on the sugar-plantation Gondang : 
Lipoero by E. KARTHAUS from a cross in which Bandjermassin hitam 
acted as the mother and Fidji as the father. According to an oral com- 
SA Jeswiet. De twee belangrijkste zaadrietsoorten van Java, 247 B en 100 
POJ. Archief voor de Suikerindustrie in Nederl. Indié 1916 p. 625. 
2) SJESWIET Cp. 631. 
LU 
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