5) 
to two synergids and the egg (Kusano, figg. 93, 94). The divi- 
sion which should give rise to the egg and upper polar nucleus 
is suppressed, there thus being no upper polar nucleus. The 
primary chalazal nucleus on the other hand divides only once. 
As a rule both nuclei fuse soon after their formation (Kusano, 
fig. 89, 90, 91). Sometimes however this fusion may be a little 
bit postponed (Kusano fig.85). Only two of Kusano’s figures do 
not agree with this suggestion. Both figures (80 and 84) represent 
nuclear divisions which by the direction of their spindles and 
by the distribution of the plasm point to sacs of the type | 
B—I—5, instead of B—IIa—8b. I must emphasize here that 
of course it is not possible to give a description of a life history 
without any material at hand. Only a thorough reinvestigation 
can clear up the matter. 
Aglaonema commutatum has been studied by CampBeLy (1900, 
1908, 1912). He did not succeed, however, to give an idea of 
the development. All his material of this species was collected 
from plants grown under more or less artificial conditions, and 
shows the common pathological phenomena like indefinite number 
of nuclei, multiple fusions and other abnormalities. Moreover 
“there is some evidence that the complete embryosac may be 
the product of the union of several sporogenous cells (mega- 
Spores). “ 2 
Nephthytis liberica is not better known (Campprrn, 1905). It 
was ,quite impossible to make out any prevailing type“, and 
as this material too came from the greenhouse, the author 
rightly remarks: “How far these are normal cannot be cer- 
tainly determined until material grown under natural condi- 
tions can be examined.“ More stress is still laid on the pre- 
sumption of pathological conditions by the fact that “the pollen 
grains were badly shrunken and distorted, and no satisfactory 
study .... could be made.‘ 
Aglaonema pictum (CaMPBELL 1903, 1912) ( 
to have a normal eight-nucleate embryosac. In his later publi- 
cation Campsers however describes the sacs as five-nucleate, 
the type being D—IIa—sb. 
Aglaonema versicolor (Gow, 1908) should be 6 to 15-nucleate. 
was first assumed 
