(353) 
In the embryo-sac at the time of fertilization we find avery 
conspicuous egg-apparatus, which extends over nearly two- 
thirds the length of the embryo-sac. The odsphere is similar to 
other cases described, inasmuch as the nucleus occupies its 
lower portion and a large vacuole fully three-fourths of its 
volume. The synergids are peculiar in the extent of their 
vacuolization (fig. 79), the nucleus and cytoplasm in each oc- 
cupying but a small space in the upperend. Here we may note 
also an absence of the hyaline and striated condition in that 
degree which characterizes some of the forms already cited. 
The antipodals are of quite ephemeral character. They 
were not observed to persist after fertilization, and usually 
begin to disorganize prior to that event (jig. 7 
The formation of the endosperm apparently has its origin 
in the usual process, by the fusion of two polar nuclei. While 
the completed fusion of the polar nuclei was not observed in 
any case, they were observed in contact. In this condition 
they were surrounded by a mass of cytoplasm filled with 
starch-grains. After fertilization the endosperm expands 
rapidly and displaces the adjoining tissue of the nucellus. 
Before the first cleavage of the embryo has taken place the 
endosperm has assumed the usual sac-like form, the nuclei 
scattered through a densely granular cytoplasm. Starch- 
erains are still abundant (fg. 80) and are more frequently of 
a compound character. The cell-walls of the nucellus in 
contact with the lower end of the endosperm show evidences 
of disintegration. The endosperm soon loses its starch and 
becomes finely vacuolated (fg. 87). 
But two stages of embryonic development were observed. 
The odspore (fg. 80) presents a rather unusual appearance, 
being large with conspicuous vacuoles. The first cleavage 
is transverse (fig. 8z). Of these two the basal retains the 
characteristics of the odspore, the other is more densely: 
granular. 
Cucumis 
The earliest stage observed in the formation of the embryo- 
sac of Cucumis was that represented by figure 82. Numer- 
