( 367 ) 
integuments have become elevated to the top of the nucellus 
the spore-mother-cell has become quite conspicuous at its cen- 
ter, and is surmounted by an axial row of cells. Here the 
form and relations of parts of the ovule are similar to those 
previously considered (jig. 7 
It is evident that the spore- ee cell divides as usual to 
form potential spores, though the process was not observed in 
its completeness. The first division takes place and the cell 
is divided equally (jig. z49). In the two-, four- and eight- 
celled stages we find a perfectly typical development. In 
each case the center of the embryo-sac is occupied by alarge 
vacuole (figs. 150-153) which becomes more or less modified 
as development proceeds. 
In the mature embryo-sac of Afzcrampelzs the various organs 
are quite prominently displayed. The egg-apparatus consists 
of a conspicuous odsphere and two very bulky synergids, in 
which there is rather less vacuolization than is evident in most 
of the forms. The antipodals are more conspicuous here 
than in any of the preceding species (fg. 155). The cyto- 
plasm which surrounds the endosperm nuclei presents a finely 
appearance, but at no time was any starch ob- 
aes init. The polar nuclei were not observed to fuse, but 
they were found in contact at the time just preceding the 
fertilization. As the embryo begins to form, the endosperm 
rapidly expands and the cytoplasm assumes a much more 
dense and compact character in its upper portion, and numer- 
ous nuclei are scattered through it (fg. 756). As develop- 
ment proceeds, however, its structure becomes more open and 
it has begun to encroach upon the nucellar tissue (7g. 757). 
Up to this time no walls have been formed between the nuclei, 
but this condition does not last long. The endosperm early 
becomes a solid cellular mass (jg. 758), in form wedge-shaped 
and often easily dissected out of the ovule. In this condition 
the mass makes rapid inroads upon the nucellus, the cells of 
which show the effect of some disintegrating agent wherever 
in contact with the endosperm. ‘This disintegration appears 
in the swelling of the cell-walls and the breaking up of the 
