Campbell . — Shi dies on the Araceae , III. 349 
Fig. 57. Upper part of the nucellus showing a secondary embryo-sac, j/ 2 ., with five nuclei, of 
which only one shows in this section ; the apex of the principal sac contains a large fusion nucleus, 
apparently made up of three. 
Figs. 58, 59. Chalazal end of the same embryo-sac; in 58 is shown the group of antipodal (?) 
cells, five in number ; in 59 the egg-apparatus (?), consisting of three cells ; there were two free 
nuclei in the sac. 
Figs. 60, 61. Two sections through the apex of an embryo-sac, with the one-celled embryo 
preparing for the first division ; there were about fourteen nuclei in the embryo-sac, but it was not 
certain that each one belonged to a distinct endosperm -cell. 
Figs. 62-64. Three sections through the apex of a sac, apparently just fertilized; there were 
two large cells, 0, sy., which probably represent an egg-apparatus with a single synergid ; the 
nucleus, n., lay close to the egg, but it may have been derived from one of the cells of the integument, 
as it had the appearance of an ordinary vegetative nucleus ; the two irregular bodies, S, s', perhaps 
were the generative nuclei, but this is not certain ; two large free nuclei (Fig. 62), one preparing for 
division, completed the contents of the sac. x about 250. 
Fig. 65. Embryo-sac, containing a four-celled embryo. 
Fig. 66. Embryo-sac with an older embryo, x 50. 
Fig. 67. Upper part of a sac and embryo of about the same age. x 250 (about). 
Fig. 68. Antipodal region of the same sac. 
Fig. 69. Embryo-sac and embryo, x 100 (about). The basal endosperm -cells have denser 
contents and larger nuclei. 
Fig. 70. Upper part of embryo-sac, with large pollen-tube (?) containing two nuclei. A second 
similar tube was present. Leitz, im. 1/16, oc. 1. 
