(366 ) 
respectively. In the latter the prospective function of the 
different cells can be determined by their position and appear- 
ances, although it is far from the mature condition, as may be 
seen by a comparison of figures 143 and 144. 
In the mature embryo-sac the synergids and odsphere are 
less vacuolated than in many of the other forms cited and the 
polar nuclei are not nearly so prominent. No starch was 
observed in the embryo-sac at any time, though oil was often 
visible (fg. 244). In this embryo-sac, which represents the 
conditions prevailing near the time of fertilization, antipodals 
are plainly evident, though apparently not functional. They 
were not found in any preparations of more advanced mate- 
rial, and somust be, like the others, of ephemeral character. 
The formation of the endosperm proceeds as usual. A 
mass of sac-like form soon appears and elongates rapidly 
toward the chalaza (fg. r45). In this numerous free nuclei 
are visible at an early stage and they multiply as the mass 
expands. The character of the cytoplasm is at first open and 
vacuolated, but later it appears densely granular and homoge- 
neous (fg. 146). At this point a large regular central vacuole 
is formed and the lower portion becomes drawn out into a thin 
strand which penetrates deeply toward the chalaza. Wails 
are formed in the upper portion, and half of the endosperm 
may sometimes appear cellular and half non-cellular (fg. 
147). 
The embryo develops slowly and various stages in its 
formation were observed. The earliest condition seen pre- 
sented the appearance shown in figure 7g5. Here the first 
division seems to have been diagonal and the second inter- 
cepting this plane and dividing the distal one of the two cells 
formed by the first division. The subsequent divisions give 
rise to a pyriform mass (fg.1746), and later to the usual 
structures described for other forms. 
Micrampelis 
In this form the initial stages in the formation of the arche- 
sporium were not observed. By the time, however, that the 
