218 BOTANICAL GAZETTE [SEPTEMBER 
EMBRYO. 
The first division of the fertilized egg is by a transverse wall 
(figs. 36-38). The terminal cell again divides, usually transversely 
(fig. 39), while the micropylar cell becomes vesicular although not 
enlarging very much. ; 
After a proembryo of three or sometimes four cells has been 
formed, the end cell is usually the first to divide by a vertical wall 
(fig. 40). However, many exceptions to this rule were found, jig. 
42 showing the second as well as the terminal cell forming a vertical 
wall; while fig. 43 shows the second cell dividing first. Figs. 44 and 
45 show anomalous forms of embryos in which no definite order 
of division can be discovered. 
From the regular octant stage the development of the embryo is 
quite rapid and usually regular, the apical octants being the first to 
divide by periclinal walls, thus differentiating the dermatogen of the 
cotyledonary region (fig. 46). Almost immediately that of the hypo- 
cotyledonary region is formed in the same way (jig. 47): Fig. 48 
shows early development of plerome, of periblem of the root, and 
the differentiation of the dermatogen of the root tip. A further 
study of the development of the embryo revealed nothing worthy 
of mention. 
POLYEMBRYONY. 
The discovery of pollen tubes near the chalazal region, as well as 
perfectly formed eggs in the antipodal end of the embryo sac; led me 
to suspect that antipodal embryos might be discovered associated 
with normally placed embryos. In several cases antipodal embryos 
were noted (figs. 51, 52), and in one case an extra-miesopylar embry 
(fig. 49). It is also likely that pseudo-polyembryony may result 
from the presence of two embryo sacs, as well-formed and probably 
fertilized eggs were observed in such cases (fig. 56). 
SUMMARY. : 
ell stage in the early 
1. The microsporangia are in the mother c 
forming 
part of February and probably pass the winter in this stage, 
tetrads at the first breaking of winter weather. 
2. The tapetum is formed from the peripheral layer 
of sporoge 
nous tissue. 
