616 Wisconsin Academy of Sciences , Arts, and Letters . 
row of cells was present having been found to be incorrect. As 
stated in her preliminary note, however, she finds the 16 nuclei 
are formed in four definite peripheral groups due to the double 
division of the four peripherally placed nuclei resulting from 
the first two divisions of the mother cell. Three of each group 
form cell membranes 1 about themselves; each of the four “peri¬ 
pheral groups’ 7 of cells so formed resembles an egg apparatus, 
while the remaining four nuclei fuse to form the endosperm 
nucleus. There is some variation in the number of nuclei en¬ 
tering into the fusion nucleus,—six oases being noted in which 
more than four nuclei fused. In these cases there seemed to be 
a corresponding diminution in the number of the nuclei to be 
found in the peripheral group of cells. 
The embryo is usually formed by the fertilization of the nu¬ 
cleus of one of the cells of the “peripheral group” nearest the 
micropyle, at the apex of the embrvo-sac, though cases are cited 
of embryo formation away from the apex. One case of poly- 
embrvony was noted with a rudimentary embryo at the apex 
of the embryo-sac cavity and another laterally placed. 
The author is inclined to regard the first four nuclei formed 
by the division of the embryo-sac mother cell as macrospore 
nuclei, “the germination of each ceasing at the four-nucleate 
stage.” She is further of the opinion that the embryo-sac of 
the Penaeaceae is to be regarded as a derived structure and not 
as primitive. 
Went has supplemented his earlier paper (106) on the Po- 
dostemaceae by a fuller account (107). He describes the ex¬ 
terna] morphology as well as the morphology of the embryo- 
sac of twelve species of the group representing the genera 
Oenone, Apinagia, Lophogyne, Mourera and Tristicha. His 
general conclusions as to the embryo-sac formation in the group 
coincide in detail with the results given in his preliminary 
paper. He finds uniformly throughout the species studied 
that tfie embryo-sac mother cell divides to form two cells, the 
outer of which degenerates. The nucleus of the inner cell 
divides, though neither cell wall nor cell plate is formed. The 
inner of the two nuclei, which Went calls the antipodal nucleus, 
