ime] THE COMPOUND OOSPHER« OF ALBUGO BLITI 241 
Fig. 20. Same as fig. 79 in resting stage, nucleolus prominent, linin 
faint. 
Figs. 21 and 22 are from the same oosphere, and in the condition shown 
in figs. 68-70. 
Fig. 21. Same as fig. 20 but passing into the spirem stage. 
Fic. 22, Nucleus elongating preparatory to division. Compare fig. g. 
Fic, 23. Breaking of skein into chromosomes, centrosomes apparent. 
Fig. 24. Spindle forming inside of nuclear membrane, nucleolus lying 
outside of the spindle. 
Fig. 25. From an oospore of the condition shown in fg. 70. Spindle 
'ying completely inside of the nuclear membrane, chromosomes grouping at 
the equator, and centrosomes well defined. 
Fi. 26. Metaphase: chromosomes splitting, membrane, centrosomes, and 
fibers clear, Fibers apparently of about the same number as the chromosomes. 
Fig. 27. Daughter chromosomes ready to leave the equator. 
Fig, 28. Anaphase: chromosomes well separated, centrosomes visible, 
Spindle fibers crossing the middle space, chromosomes six in number. From 
Sime oospore as figs 24 and 27. Compare with fg. 76. 
Fig. 29. Later anaphase: chromosomes near the poles, area in which 
they rest darker stained than central portion. 
Fig. 30. Similar tofig.z8. Spindle fibers collapsed and daughter nuclei 
tady to separate. From same oospore as fig. 29. 
oo male nucleus from the entrance of antheridial tube. This 
€ same as the one marked X in fig. 73. 
Fi, 32. A nucleus (sperm) in the tip of the same tube that contained that 
m fig. 37, also marked X, Wall of the antheridial tube, dense 
Foplasm su 
son, Tounding nuclei, sperm with nucleolus and mass of chromatin 
_ “anterior end, 
Fig, : 
rey se Tube open, elongated and pointed sperms escaping, showing a 
MBit network, one female nucleus shown. This is part of the 
pes F gs own in fig. 8&5. 
Ig, ; 
than ; 34. A sperm approaching a female nucleus, linin more prominent 
Nn fig. 3 2, 
Fig, : 
Mound, cay Sperm in contact with a female nucleus, becoming more nearly 
; > ts linin still more prominent. 
: GS, ‘ 
Hk t0 40. Various stages of fusion, from oospores of the general 
“Rote Na represented in fig. go. During fusion the whole nucleus becomes 
cae Y Stained with gentian-violet. 
er aee 
- Otdinary ®nocentrum with globule at its center, female nucleus near by, 
vacu 
oles of the Oosphere near the margin. 
