94 EDWIN G. CONKLIN 
Fig. 17 Centrifuged four hours (2000 revolutions per minute); fixed six hours 
after. Evidently centrifuged during first cleavage. The cleavage plane does not 
pass through the polar axis. The spindles are proportional to the size of nuclei 
from which they were formed, and to the volume of cytoplasm in which they lie. 
They are not parallel to the plane of the first cleavage, which is here out of its 
normal position. 
Fig. 18 Centrifuged fifteen minutes in gum arabic; fixed three hours after. 
Evidently centrifuged during first cleavage. The second cleavage appeared 
earlier in the more protoplasmic cells (A and B), than in the others. 
Fig. 19 Centrifuged thirty minutes; fixed six hours later. Evidently centri- 
fuged during the first cleavage. The size of the nuclei is plainly dependent upon 
the volume of the cytoplasm in which they lie. 
Fig. 20 Centrifuged four hours, (2000 revolutions per minute); fixed at once. 
Evidently centrifuged during the second cleavage; the daughter nuclei are pro- 
portional in size to the volume of cytoplasm in which they lie. 
