236 it BOTANICAL GAZETTE [OCTOBER _ 
PLATE XX1. 
Fic. 1. A resting nucleus from a cell beyond the growing rans Anilin- 
safranin, iron-alum-haematoxylin. Zeiss oc. 18, B. and L. obj. + = a 
Fic. 2. Resting cell with centrospheres from the growing nie Anilin- — 
safranin. Zeiss oc. 12, B. and L. obj. +y | 
Fig. 3. Cell just before division, stained very deeply. Iron-alum-haema- 
toxylin. Zeiss. oc. 12, B. and L. obj. 7y. 
1G. 4. Nucleus with centrospheres on opposite st in early stage of 
division. Iron-alum-haematoxylin. Zeiss oc. 12, obj. 2™™ ap. hom. im. 
Fig. 5. Cell with incept of achromatic spindle and centrospheres at sy 
poles. Iron-alum- haematoxylin. Zeiss. oc. 12, B. and L. obj. +s 
Fig. 6. Long cell with bipolar spindle having sharper ends than usual at 
this stage. Acid fuchsin, methyl- -green. Zeiss. oc, 12, B. and L. obj. +s. 
Fic. 7. Close mother skein with no spindle visible, but with radiations at 
the two ends of the nucleus. Anilin- safranin, iron-alum-haematoxylin. Zeiss 
oc, 12, B, and L. obj. yy. 
Fie. 8. Cell with centrospheres and granular zones outside of the polar 
radiations. Iron-alum- -haematoxylin. Zeiss oc. 12, B. and L. obj. py. . 
FIG. 9. Cell with late separation of centrospheres and precocious division 
of the centrosomes. Delicate radiations around the nella ates Anilin- 
safranin, gentian-violet. Zeiss oc. 12, B. and L. ‘0 
Fig. 10. Nucleus with very flat dome-shaped iets and cytoplasm 
radiations or streams. Acid fuchsin. Zeiss oc. 12, B. and L. obj. +: 
Fig. 11. Cell with centrosomes and distinct coarse radiations. oe 
safranin, gentian-violet. Zeiss oc. 12, B.and L. obj. + 
Fic: 12, Early dome- -shaped spindle with no centrosomes visible. Iron- 
alum- “haematoxylin, Zeiss oc. 12, obj. 2™™ ap. hom. im : 
Fig. 1 . Looped mother skein showing radiations around the poles of the 
= spindle. Acid fuchsin. Zeiss oc. 12, B. and L. obj. +y 
- End view of looped mother skein. Anilin-safranin, iron-alum- Seg 
I 
Recast: Zeiss oc. 12, B. and L, obj. +y. 
: FIG. 15, Dome-shaped spindle with centrospheres. Anilin-safranin, gen- 
tian-violet. Zeiss oc. 12, obj. 2"™ ap. hom. im 
Fig. 16. Dome-shaped spindle becoming pointed, with prominent radia- 
tions around the une ee iron-alum-haematoxylin. Zeiss 0c. 
12, B. and L. obj. + 
Fig. 17. Dimesdajcd spindle with prominent centrospheres. Anilin- 
safranin, iron-alum- -haematoxylin. Zeiss oc, 12, B, and L. obj. +s. 
Fig. 18. Spindle epee Fe — Anilin-safranin, gentian-violet. 
Zeiss oc. 12, obj. 2™™ ap, hom 
