150 
ALBERT H. TUTTLE 
1. The marked increase in size of the dividing nucleus; from 
four to four and a half times the volume of the resting nucleus. 
2. The conspicuous change in form of the enlarged nucleus, 
from a nearly spherical to an elongated fusiform shape. 
3. The persistence of the definite contour of the nucleus up 
to the last of the anaphase. 
4. The marked irregularity in shape and particularly in size 
of the chromosomes. 
5. The straggling and irregular manner in which the chromo- 
somes approach and recede from the equator, and in the occasional 
fragmentation of the daughter chromosomes. 
6. The intranuclear position of the achromatic figure; its 
feeble development; its imperfect polarity; its apparent origin 
in the equatorial region toward the close of the prophase, with 
subsequent development of fibers toward the poles in the anaphase 
and the doubtful presence of well defined connecting fibers be- 
tween the two groups of daughter chromosomes. 
7. The sudden coming together of the daughter nuclei during 
the telophase, compressing between them the irregular residuum 
of the original nucleus; and in the subsequent migration of one 
of them to the region of the ring, while the other passes (appar- 
ently somewhat less rapidly) to a position near the center of the 
original cell. 
