Campbell.—Studies on the Araceae. 17 
to decide just how many of the basal cells really belong to 
the antipodal group. In the specimen figured, the line of 
junction between the two is very evident. In this case there 
were eight antipodal cells, which were characterized by very 
large nuclei and granular cytoplasm. The nuclei showed 
some signs of degeneration, especially in the upper cells, and 
it is doubtful whether they would divide any further. In 
other cases, the antipodal cells were somewhat smaller and 
more numerous, but being less clearly distinguishable from 
the lower endosperm cells, it was not possible to be sure 
exactly how many of them there may be, but there are 
probably a dozen or more in some cases. 
The Embryo. 
The earliest stages of the embryo were not found in 
Lysichiton , but in Aglaonema several very young embryos 
were met with, which correspond closely with those of Pothos 
figured by Hofmeister. The earliest stage encountered was 
a two-celled embryo, shown in Fig. 28. The two cells were 
of nearly equal size. Of these the terminal one, i. e. the one 
at the free end, undergoes a transverse division, resulting in a 
three-celled stage like that generally met with in Monocoty¬ 
ledons. It is the terminal cell, which probably gives rise to the 
greater part of the embryo, although in the three-celled stage 
shown the terminal cell is the smallest of the three. As this 
was the only specimen met with in this condition, we cannot 
say whether this is normal. In a somewhat older one 
(Fig. 33), the terminal segment was very much larger, and 
had already undergone division. Here the end of the embryo 
was decidedly pointed, but this is probably not a constant 
character. The first division in the terminal segment in this 
case was somewhat oblique, and followed in the larger cell by 
a wall meeting the first one nearly at right angles. The 
appearance of this embryo was very much like that of certain 
grasses figured by Norner 1 . The stages following were not 
1 Norner, Flora, 1881. 
C 
