iy6 
Kis. 1 4. 
Fig. 15 - 
Fijj. i6. 
Fig. 17. 
Fig. 18. 
Fig. 19. 
Fig. 20. 
Fig. 21. 
F'ig. 22. 
Fig. 23. 
Fig. 24. 
Fig. 25. 
F'ig. 26. 
Fig. 27. 
Fig. 28. 
Fig. 29. 
Fig. 30. 
Fig. 31 - 
Fig. 32. 
Fig. 33 - 
Fig. 34. 
Fig. 35 - 
Fig. 36. 
Fig. 37 - 
Fig. 38- 
Fig. 39 - 
Fig. 40. 
The Ohio Naturalist. [Vol. IV, No. 8, 
Fimbr3’o-sac with fusion of the gametes and triple fusion below. 
Below the sac appears the beginning of the cavity formed bj- the 
breaking down of the ovular tissue, with axial row of glandular 
cells. 
PFATE XVII. 
Abnormal embryo-sac, showing three separate nuclear fusions. 
Earl\- stage in development of the axial row of cells. 
Axial row of cells further developed. 
Perfectlj’ developed axial row, surrounded bj- a cavity- formed bj' 
the breaking down of the cells of the surrounding tissue. 
The cavity below the sac, with irregularlj’ developed axial row. 
Basal cavity below the embryo-sac, with irregularlj’ developed axial 
row. 
Basal cavity with groups of nuclei massed together. 
Three-celled embr3'o. 
F'our-celled embr3'o and pollen tube. 
F'our-celled embr3’o with pollen tube and early formation of endo- 
sperm. 
Six-celled embryo with remains of pollen tube and one S3’nergid. 
Section of young spherical embryo. 
Endosperm and embr3-o somewhat flattened b3’ being in contact 
with the wall of the ovule. 
Section of embr3'o, showing difference in staining between the 
basal and outer parts. 
Section of spherical embr3’o. 
Section of embr3'o, showing the flattening due to the development 
of the incipient “ cot3dedonar3’ ” ridge. 
PLATE XVIII. 
Section of the flattened embr3’o further developed. 
Section of embryo, showing the two sides of the cotyledonar3' 
ridge. 
Section of embryo, showing the beginning of the dome-.shaped 
protuberance between the cot3'ledonar3’ lobes. 
Section of the dome-shaped protuberance, or the incipient plumule, 
showing terminal origin, side by side, of first leaf and stem tip. 
Outline section of embr3 0, showing incipient plumule. 
Outline section of embryo, showing the plumule further advanced. 
Surface view of the incipient plumule a little older than in F'ig. 36. 
Outline section of plumule, showing the beginning of the develop- 
ment of the leaf blade. 
Surface view of a still older plumule than Fig. 38. 
Outline of section of enibr3'o, showing the position of the first three 
leaves. 
