1908] BURLINGAME—PODOCARPUS 167 
which seem to be of different material because of the considerable 
difference in depth of staining. 
The spirem gradually becomes denser and ramifies all through the 
nucleus (fig. rz), the nucleolus disappears, and finally the spirem 
breaks into elongated loops, which arrange themselves into a tangled 
mass at the equatorial plate. The exact method of division was not 
made out owing to the close tangling of the long chromosomes. In 
the anaphase the chromosomes appear as twenty-four straight 
elongated rods of about half the length of those entering the mitosis 
g. 12). 
As the chromosomes approach the poles, the polar ends draw 
together and the others spread out, so that the daughter nucleus 
usually has a concavity on the polar side. The chromosomes gradu- 
ally lose their density and put out processes on one side or the other 
to fuse with those put out by neighboring ones, thus establishingja 
sort of reticulate structure (fig. 13). This gradually passes back into 
the Stage shown in jig. 7. In the reorganizing nucleus one large 
nucleolus may appear or several small ones, but I did not attempt to 
discover the origin of them or their relation to one another. 
When the cells have reached the mother cell stage, they break 
loose from one another and round up in the usual manner. As already 
remarked, the mother cells killed and fixed very poorly, so that only 
* very meager and perhaps uncertain account of them can be given. 
About the time the mother cells round up many of them begin to 
abort; this abortion seemingly may occur as late as the young spores. 
Up to this time and on to the time of the divisions in the young micro- 
Spores the development of the sporogenous tissue seems to be nearly 
simultaneous, 
_ After the mother cells have rounded up, the nucleus soon passes 
into a condition in which its contents stain so nearly uniformly that it 
has not proved possible to disentangle its separate constituents. If 
Stained deeply, it appears absolutely uniform, and if the stain be 
then slowly and gradually drawn, the homogeneous appearance gives 
Way to a sort of pebbled one. Sometimes it looks as if this might be 
due to the parts of a large and long spirem being crowded closely 
together. This interpretation is strengthened by the fact that in some 
“ases one can see what looks like the end of a loop pushing out the 
