218 MARY T. HARMAN 
pearance, showing that they are in the process of reconstruction. 
The light area is appearing around the mass of chromatin, but 
the centrosomes are still faintly visible. Judging from the posi- 
tion of the centrosomes, this spindle was evidently a long one, 
and evidently reconstruction began when the chromatin was some 
distance from the poles. If these daughter nuclei should com- 
pletely reconstruct and should reach the usual size of nuclei of 
the resting stage of cell-division, there is no doubt that they would 
lie in close contact if not even press against each other. It can 
easily be seen that such nuclei could give rise to nuclei having 
the relative positions of the nuclei shown in figures H to K in- 
elusive of plate 6, or to daughter nuclei which would be in as 
close contact as those shown in figures F and G of the same 
plate. On the other hand, it would be pretty hard to imagine 
how the daughter nuclei, arising from the reconstruction of the 
chromatin masses as shown in figures I and J, plate 4, could lie 
in close contact. They would undoubtedly give rise to daughter 
nuclei with a relative position similar to that of those shown in 
figure L of plate 6. 
Figure G, plate 5, shows the process of reconstruction of the 
nucleus more nearly completed than is shown in figure F of the 
same plate. The centrosomes have disappeared and the chro- 
matin is in a more finely divided state. Although the reconstruc- 
tion is by no means completed and the nuclei have not reached 
the usual size, the two nuclear areas lie against each other. If 
reconstruction should be completed, it is entirely possible that 
it would give rise to a condition such as is shown in figure E of 
plate 6. The reconstruction of the chromatin in a division like 
the one shown in figure D of plate 5, could very easily give rise 
to daughter nuclei having the relative position of the nuclei 
shown in figure J of plate 6. Here the nuclei lie in contact with 
the periphery of the cell on the opposite sides and yet they touch 
each other. 
The reconstructions just described are reconstructions after the 
first segmentation spindle. Reconstructions of later segmenta- 
tions are shown in figures G and H of plate 7. The nuclei 
shown in the process of reconstruction in figure H, are evidently 
