ee 
FISHER: SEED DEVELOPMENT IN PEPEROMIA 239 
78. - Le sac embryonnaire et l’embryon dans les Angio- 
sperms. Ann. Jard. Bot. Buitenzorg II. 9: 1-17. pl. 1-5. 
I9I0. 
79. Wiegand, K. M. The development of the embryo sac in some 
monocotyledonous plants. Bot. Gaz. 30: 25-47. pl. 6, 7. 
1900. 
80. Yamanouchi, S. Mitosis in Fucus. Bot. Gaz. 47: 173-197. fl. 
8-rr. Mr 1909. 
81. York, H. H. The embryo sac and embryo of Nelumbo. Ohio 
Nat. 4: 167-176. pl. 16-18. 1904. 
Ex planation of plates 3-6 
All figures are camera drawings except Fics. 25 and 26, and all are from micro- 
tome sections except Fics. 25, 26, and 36. The magnification given in the descrip- 
tion of each figure is that actually shown by the figure as printed on the page. 
Fics. 1-18. Peperomia reflexa 
Fic. 1. Longitudinal section of nucellus showing primary archesporial cell. 
X 670. 
G Longitudinal section of ovule, showing an ee archesporial or 
embryo sac mother-cell, and parietal or ‘tapet 
Fic. 3. Longitudinal section of nucellus ini ae embryo sac mother- 
cell and ee tapetum. X 670. 
Fic. 4. gitudinal section of carpel showing subtending bract, nucellus, 
te yo sac iat integument, micropyle, stylar canal, and immature stigma. 
Fic. 5. Longitudinal section of definitive archesporial cell, or embryo sac 
mother-cell, the nucleus showing synapsis. 70. 
IG. 6. Nearly longitudinal section of a two-nucleate embryo sac showing 
evanescent cell-wall. Xx 670. 
IG. 7. Longitudinal section of a four-nucleate embryo sac showing tetrahedral 
arrangement of the nuclei. 670. 
Fic. 8, Longitudinal section of a four-nucleate embryo sac showing evanescent 
céll-wall, X 670. 
Fic. 9. Longitudinal section of an eight-nucleate embryo sac. 
Fic. 10. Longitudinal section of an embryo sac containing sixteen fies nuclei. 
Fic. rr, Longitudinal section of a mature embryo sac showing group of endo- 
Sperm nuclei. x 670 
Fic. 12, Group of eight nuclei almost pt me fused to form the endosperm 
nucleus (from transverse section of spike). X 6 
Fic. 13. Longitudinal section of an es sac showing egg, two peripheral 
oe and two-celled endosperm. X 670. 
- 14. reigacaeseiey section of an embryo sac showing male nucleus within 
the sa but not yet fused with the egg-nucleus, also the single synergid and the 
Several celled mmetedeeting X 465. 
