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When the daughter chromosomes have arrived at the poles and before 
any trace of a nuclear membrane is visible, neither centrosome nor polar 
radiations are to be seen. Sometimes a small, densely-stained body may 
be seen lying against the nuclear wall, but since these bodies are precisely 
like others scattered about in the cytoplasm, it would be mere empiricism 
to speak of them as centrosomes. 
The vegetative cells of the gametophyte of Marchantia can not be said 
to be especially favorable for the study of the karyokinetic process. The 
nuclei are small and the chloroplasts as a rule collect about the centro- 
spheres, thus obscuring many of the finer details. 
ENDOSPERM HaAuvsTroRIA IN Lintum CANDIDUM. By Davip M. Mortier. 
[Abstract.] 
So far as the writer is aware, there is as yet no case on record in 
which it is known that a special provision is made by the endosperm of 
any of the Liliaceae for increasing the absorbing surface in the chalazal 
region. 
During a study upon the fecundation in Liliwm candidwm, it was noticed 
that cells of the developing endosperm bordering upon the chalazal surface 
were rendered strikingly conspicuous by their denser contents and the 
presence of karyokinetic figures, and that the sharp and regular line of 
demarkation between endosperm and the tissue of the ovule almost dis- 
appears at the chalaza. Here the endosperm cells send out short, irregu- 
lar tubes which penetrate the tissue of the chalaza in a way similar to 
that in which the cells of the foot of the sporophyte in Anthoceros become 
rooted in the tissue of the gametophyte. 
The growth of the developing seed is such that, before the endosperm 
completely fills the cavity of the embryo-sac, the chalazal region is forced 
into a lateral position with respect to the longer axis of the seed. The 
chalazal end of the embryo-sac originally occupied by the antipodal cells 
persists as a small cavity, which is now filled with a few endosperm cells, 
projecting into the chalazal tissue. A longitduinal section of the endosperm 
at this stage in development, coincident with the plane of the funiculus, 
presents, in the chalazal region, a picture recalling that of a longitudinal 
section through the foot of the sporophyte of Anthoceros. 
