Overton—On the Boot Tips of Podophyllum Peltatum. 321 
Fig. 9. Two daughter cells, showing what appears to be complete distribu¬ 
tion of the substance of the chromosomes into a resting reti¬ 
culum. No evidence of chromosome individuality, absence 
of prochromosomes, and no karyomeres. Flemming’s strong 
solution. Triple stain. 
Fig. 10. Enlarged portion of the upper nucleus shown in figure 0. In 
this nuclear reticulum the linin portions are stained orange 
and the enclosed chromatic substance violet with the triple 
combination. 
Fig. 11. Portion of a cell showing prohpasic nucleus with reticulate chro¬ 
mosomes distinct in the foreground. Merkel’s fluid. Triple 
stain. 
Fig. 12. Portion of a cell showing prophasic nucleaus with elementary 
reticulate chromosomes or bands, one such band forming a 
lobe on the left of the figure. Merkel’s fluid. Triple stain. 
Fig. 13. Later prophasic stage, showing distinct, reticulate, condensing 
chromosomes or bands on right of figure. Merkel’s fluid. 
Triple stain. 
Fig. 14. Portion of nucleus in prophase stage, showing condensation of 
portions of chromosomes and spiral aspect of the thread at 
the right of figure. Merkel’s fluid. Triple stain. 
Fig. 15. Portion of a prophasic nucleus, showing condensation of the 
chromosomes and evolution of spiral threads. Zenker’s fluid. 
Triple stain. 
Fig. 16. Prophasic stage of nucleus showing chromosome bands cut trans¬ 
versely and irregular arrangement of chromatic platelets of 
each band. Merkel's fluid. Iron-alum-haematoxylin stain. 
Fig. 17. Prophasic Stage showing simple zigzag arrangement of threads 
with indication of longitudinal split. Zenker’s fluid. Triple 
stain. 
Fig. 18. Portion of zigzag thread showing longitudinal split. Merkel’s 
fluid. Iron-alum-haematoxylin stain. 
Fig. 19. Later prophasic stage showing disappearance of zigzag arrange¬ 
ment of thread and its complete longitudinal fission. Chro¬ 
mosomes show polar orientation in nuclear cavity. Zenker’s 
fluid. Triple stain. 
Fig. 20. Cell showing longitudinally split chromosomes in nuclear cavity. 
Chromomeres evident in each half of split chromosomes. 
Polar caps in cytoplasm. Zenker’s fluid. Iron-alum-haemat¬ 
oxylin stain. 
21—S. A. L. 
