492 
Max Morse 
poiuted eud directed poleward (fig. 14, 16 and 17). The attenuated 
tliread which may be seen runuing from its poiuted eud towards the 
j)ole (fig. 16) does not participate iu the thickening afi'ectiug the otlier 
chromatiu elements (fig. 19) and the chromosome itself is uot aff'ected 
iu any manner. Its size remains the sarue throughout the synaptic 
period. 
c) The plasmosome. A slight displacfment of the plasmosome 
from its position near the chromosome-nucleolus seems to take place 
in some of the cells (fig. 16 , but this is not characteristic, for it 
retains, typically, its attachment to that lody. Owing to the size 
of the threads in the later stages, the plasmosome sometimes is not 
distinguishable (fig. 19), but tliere is no reisou to believe that it has 
been lost, for it is seen in a later stage where the chromatin elements 
of the nucleus are more separated (fig. 3). Differential stains render 
it evident that we are dealing here will a plastin body and not a 
chromatic one. 
4. The later growth period and th formation of the prophase 
figures 
a) The ordinary chromosomes. for a time (fig. 19), the loops 
remain polarized as they have throgh the synaptic stages, but tliere 
comes a time when this polarizatior is lost (fig. 20) and the ehromo- 
somes become distributed througf the nucleus in a promiscuous 
manner. They lie, as a rule, cloely applied to the nuclear wall. 
The longitudinal split is still in eideuce, but in the following stage, 
it is lost to view (fig. 21). This stge when the polarization disappears 
must be of some duration, for Ae greater nurnber of festes show 
mauy cysts with cells in these shyes. A second polarization, however, 
uow occurs (fig. 21), the chromsomes bearing the same relation to 
the centrosomes as before. one of the centrosomes begins to 
migrate around the nucleus (£• 22) and some of the chromosomes 
accompany it so that when tls body reaehes the side of the cell 
opposite its original position near its fellow (fig. 23), the nucleus 
presents a bipolar arrangemey, some of the chromosomes in the form 
of loops beiug attached to oe pole and the remainder to the otber. 
The longitudinal split, whicy became indistinguishable for a time is 
now again in evidence altVugh there is no means of determining 
whether it is the same asxhe original one or different, which has 
arisen after the two por^ns of the earlier body have completely 
