8 Campbell’—Sttidies on the Araceae. 
antipodal group is very similar (Fig. io), but later they show 
some differences. So far as could be told from a somewhat 
imperfect series of stages, the fusion of the polar nuclei takes 
place some time before fertilization—at any rate in all cases 
where the structures of the embryo-sac were complete, the 
polar nuclei had entirely fused. 
The mature ovule (Fig. 9) has a very short and thick 
funiculus, and has assumed the anatropous form. The nucellus 
is relatively very small, and except at the apex and base 
has had its cells completely destroyed by the growth of 
the embryo-sac. The inner integument is only moderately 
developed, but the outer one is very thick, especially on 
the side next the funiculus. 
The cells of the egg-apparatus (Figs. 13,14) are much alike. 
In the specimen figured there was present in the egg-cell, 
besides the egg-nucleus, a small deeply-stained body (g.), 
apparently a nucleus, which may have been one of the male 
nuclei; but the pollen-tube could not be detected, and both 
of the synergidae were intact. The antipodal cells (Figs. 
10, 12) are large and conspicuous, and closely resemble the 
cells of the egg-apparatus. A peculiar character of this 
Aroid, which however seems not uncommon in the family, 
is the presence of starch-granules in the unfertilized embryo- 
sac, especially about the endosperm-nucleus (Figs. 11, 15). 
Unfortunately, although repeated efforts were made, I was 
unable to procure specimens in which the ovules were fertilized, 
so that I am unable to state what is the further history of the 
embryo-sac and embryo. 
Aglaonema. 
The genus Aglaonema belongs to the East Indian and 
Malayan region, but specimens were flowering freely in the 
Hope botanical garden near Kingston. The plants were 
labelled Dieffenbachia Aglaonema , but were determined to be 
Aglaonema —probably A. commutation , Schott. The genus 
differs from Dieffenbachia in having the carpels entirely 
separate, and the base of the spadix quite free from the 
