28 ATLAS OF THE FERTILIZATION AND KARYOKINESIS OF THE OVUM. 



Plate IX. Phototype 33. 



Cross-section of the Karyokinetic Figure, shozuing the Chroniosornes. 



This specimen is of the same stage as the last, but viewed in cross-section (i.e., from the end of the spindle). In the 

 section, 38 chromosomes can be counted, but not more than 30 are in focus. Half of these are of paternal, half of maternal, 

 origin. This view shows the important fact that the chromosomes do not surround the spindle, but extend through its 

 entire diameter. There can, therefore, be no distinction between a "central spindle" and a "spindle-mantle." If two 

 kinds of spindle-fibres be present (cf. p, 27), they must be intermingled. But there is no evidence that the fibres are, in 

 this case, of two kinds. 



