~ 
| 
AND SPECIES HYBRIDS WITHIN THE GENUS SACCHARUM 143 
mosomes which moved apart, and which where lying one above the 
other, could not be drawn; 3 mikron below the aequatorial plate a 
chromatine-element with distinct double-structure is seen; perhaps 
this is a geminus more perobably it consists of two unpaired chromoso- 
mes lying close together. Very probably this nuclear plate consequent- 
ly contains 39 gemini and two unpaired chromosomes. F ig. 42 shows a 
nuclear plate with 45 chromosomes, part of these must be univalent, 

Fig. 43. 
Fig. 41. Nuclear plate of the heterotype division of G. G. N. G. viewed from.a 
pole x 2300. 
Fig. 42. Metaphase of the heterotype division of G. G. N. G. viewed from a pole 
(irregular division) x 2300. 
Fig. 43. Metaphase of the heterotype division of G. G. N. G. viewed from a pole 
(irregular division) x 2300. 
notwithstandung the fact that these cannot with certainty be distin- 
guished from the bivalent ones. F ig. 43 shows a nuclear plate in the 
first stage of anaphase. The chromosomes, not yet in anaphase, are 
drawn dark grey, the , anaphase-chromosomes”’ lying at a high level, 
black, those at a low level pale-grey. One sees that the chromosomes 
of a low level are drawn in the figure a little to the right of those of a 
high level, so that the longitudinal axis of the spindle was not exactly 
