324 BOTANICAL GAZETTE [ NOVEMBER: 
Fic. to.. Embryo sac after fertilization; oospore, 0; synergids, s. X 1060. 
Fig. 11. One-celled proembryo; pollen tube, Zz; synergid, $258 peatias 
endosperm nucleus, ed. nu. 
Fic. 12. Embyo sac showing relative size of proembryo and the distribu- 
tion of endosperm. xX 1060. 
. PLATE XXVIII. 
1G. 13. Three-celled proembryo ; basal suspensor cell, a, intermediate 
cell, 6, terminal embryo cell, c. x 1060. * 
1G. 14. Same, farther advanced. 1060. oa 
Fig. 15. First longitudinal division of the terminal embryo cell, c. X 1060. — 
Fic. 16. Second longitudinal division of c. 1060. 
Fic. 17. Octant stage, two nuclei cut away in sectioning; intermediate 
cell, 6 much divided. x 580 
Fic. 18. Embryo with dermatogen. x 580. 
Fig. 19. Same, with more cells in suspensor. 580. 
Fic. 20. Embryo showing remains of pollen tube, # 7; basal embryo cell; 
_e, the terminal embryo cell is divided into two distinct tiers, c and d. X580. 
Fic. 21. Embryo showing a series of transverse divisions in tier d, and- 
two longitudinal divisions in basal embryo cell, ¢. 580. ; 
~ F1G. 22. Suspensor which seems to indicate intercalary division. 1060. 
F1G, 23. Abnormal suspensor in which intercalary division has been 
BP instead of transverse ; plerome shaded. 
G. 24. More advanced enbryo showing longitudinal division in plea 
X 1060. 
Fic. 2 5. Transverse division ees the longitudinal ; basal embryo 
cell divided: into two tiers, fand g. 
Fics. 26. and 27. Embryos Rodin same silicle, showing abnormal suspensor 
and basal embryo cell. Shaded and light areas show difference in staining 
where triple staining was used. X 1060. 
Fic. 28. Embryo having four tiers in plerome and two in the region vices 
the stem tip and cotyledons originate. 580. 
.* 
PLATE XXVIII. 
FIG. 29. Pus with four tiers in plerome; a series of longitudinal walls 
appearing in the inner tier ; three rows in region of cotyledons. 1060. 
FIGs. 30—32. Large aenbieis showing development of calyptrogen, root eae 
cap and root tip. x580o. eee 
Fic. 33. Section through ah tip, showing plerome, periblem, dermato- - : 
gen, calyptrogen, and root cap. 
1G. 34. Nearly mature bie howl suspensor still persisting. x90. 
Figs. 35-39. Antipodal end of embryo sac, showing antipodals disappear- ee 
ing and endosperm forming thallus-like growth. hic 35-38, X 10603 Ao os 
39. X 599. 
