(349) 
has reached any considerable degree of development (fg. 59). 
A few cells from the upper end of this mass are shown in 
detail (fig. 60). In these the scant cytoplasm is a very promi- 
nent feature. 
The embryo proceeds from a fertilized oédsphere, presum- 
ably. The process of fertilization was not observed, but 
conditions in the embryo-sac appear to point to the odsphere as 
the functional cell. What seem to be disorganized syner- 
gids are plainly visible in the embryo-sac after the embryo 
has begun to form. At any rate the embryo begins its growth 
by a series of transverse divisions (jigs. 57, 58). Of the cells 
thus formed the proximal ones act as a suspensor of very 
transient duration. The distal cells enlarge to form a pyri- 
form mass in which, atthe stage indicated by figure 67, there 
is no differentiation in any structure, unless it be a layer of 
very irregular epidermal cells. The next stage observed in 
the formation of the embryo is represented by figure 62, which 
shows the cotyledons partly developed and the root-cap differ- 
entiated. In an embryo of this age there is no tissue differ- 
entiation beyond that of root-cap and epidermis. In the 
radicle, however, the cells have become arranged in regular 
series converging in the apical meristem. 
The development of the parts of the ovule presents no 
features of importance differing from those already described 
for some of the foregoing forms. As in other cases, also, 
the nucellus expands rapidly after fertilization and gives way 
before the growing epidermis. The seed attains the propor- 
tions of maturity before the embryo has proceeded beyond 
the condition represented by figure 62. 
Momordica 
Asin the case of Bryonopsis and Trichosanthes, the ovules 
of Momordica arise as small elevations on the right and left 
flanks of the placental ridges. The origin of the arche- 
sporium was not observed, but the spore-mother-cell was 
found in an advanced condition (fg. 63). In this case it 
occupies a central position in the rapidly growing nucellus 
