106 Wisconsin Academy of Sciences, Arts and Letters. 
EXPLANATION OF PLATE IX. 
Figs. 9 a, b. Two successive sections of a cell showing a quadri- 
polar spindle. 9a lies above 9b, and the starch mass is in the section 
above 9a. 
Figs. 10 and 11. Completed spindle. Some chromosomes are well 
on the way to the poles, while others are still at the equator of the 
spindle. 
Fig. 12. Reconstructed daughter nuclei. The starch mass moving 
in between the nuclei; in the planes above and below that of the draw¬ 
ing it reaches almost completely across the cell. 
Fig. 13. Multipolar stage in the formation of the spindles in the 
second division. The starch mass forms a plate across the cell separat¬ 
ing the two figures. 
Figs. 14 a, b. Two successive sections of cell in anaphases of sec¬ 
ond division, 14a above 14b. The spindle represented in 14a lies at 
an angle to the plane of the section, the left hand pole being higher 
(part of it lies in next section above), the right hand pole lower and 
hence represented lighter. The left pole is above the starch plate. 
The starch plate is depressed by the right pole and appears in part in 
Figure 14b. The spindle shown in 14b lies in the plane of the section. 
The spindle poles of 14a are as well developed as those of 14b. 
