1900 | ENDOSPERM AND EMBRYO OF PEPEROMIA a E 
gn, peripheral nucleus of the embryo-sac; fs, perisperm: fsfm, nucleus of 
perisperm cell; #7, pollen tube; sé, stigmatic lobe of carpel; sy, synergid ; 
tp, tapetal cells. 
All figures are camera drawings from microtome sections. 
Fic. 1. Longitudinal section of axis, bract, and carpel containing nearly 
ripe (sinteen nucleate) embryo-sac. X 150. 
F Longitudinal section of an ovule with a four-nucleate embryo- 
sac. X 440. 
F1G. 3. Longitudinal section of an embryo-sac after -the entrance of the 
pollen tube and male nucleus into the egg, and showing the group of nuclei 
that fuse to form the single endosperm nucleus (those with dotted outlines 
are in the next section to the one from which the rest of the figure is drawn). 
* 775+ 
Figs. 4-8. A series of sections of a group of nuclei fusing to form the 
endosperm nucleus, in an advanced stage of fusion and with large fused 
nucleoli; in fg. 7 the other contents of the embryo-sac are shown ; the fig- 
ures are numbered in the order of succession of the sections. X 775. 
Fig. 9. Longitudinal section of embryo-sac, showing the fusion of male 
and female nuclei in the egg, and a spindle of the second division of the 
endosperm nucleus; the upper nucleus of spindle from another section. 
x 775- 
Fic. 10. Part of a tangential section of embryo-sac, showing begin- 
ning of the formation of a cell-wall from the cell plate of the dividing endo- 
sperm nucleus. X 775. 
1G. 11. Approximately transverse section of the upper end of an 
embryo-sac like that shown in fig. 9. X 775. 
Fic. 12. Longitudinal section of the upper end of an embryo-sac 
through the synergid and an eight-celled embryo. X 775. 
Fic. 13. Longitudinal section through the upper end of nucellus of a 
nearly ripe seed, containing an embryo of twenty or more cells surrounded 
by endosperm. 75. 
1G. 14. Longitudinal section through axis, bract, and a nearly ripe 
fruit; endosperm and embryo practically as in fig. 13. X 75. 
Fic. 15. Part of section of carpel, integument, and perisperm from jig. 
7g (at the left from the base of the embryo-sac). X 775. 
