28 Campbell . — - Development in Lilaea subulata. 
Fig. 21. An older ovule with the tapetum (/.) already divided; in 1 , first, in 2 , 
second integument ; x 600. 
Fig. 22. A still older ovule. The lower cell of the axial row is becoming 
disorganized, and the one above it has two nuclei, but no division-wall has formed 
between the latter. 
Fig. 23. The nucellus of an older ovule, showing the young embryo-sac with 
two nuclei ; the section is cut somewhat obliquely ; m, the remains of the upper 
archesporial cell. 
Fig. 24. An older embryo-sac with eight nuclei; p, p l , the polar nuclei. The 
egg-nucleus lies immediately below the upper polar nucleus. 
Fig. 25. Longitudinal section of a flower with style of medium length, showing 
the stigmatic papillae, si. ; x 100. 
Fig. 26. Embryo-sac with egg-apparatus and antipodal cells fully formed, but 
the polar nuclei not yet united ; only two antipodal cells show in the section ; 
X about 600. 
Fig. 27. Upper part of a fully developed embryo-sac ; en., the endosperm-nucleus ; 
x 650. 
Fig. 28. The antipodal end of the fully developed embryo-sac ; x 650. 
Fig. 29. Two sections of an embryo-sac with a two-celled embryo ; s, the 
remains of one of the synergidae ; x 300. 
Fig. 30. Upper part of an abnormal embryo-sac. There were eight nuclei, two 
of which do not show in this section. 
Figs. 31-35. Successive stages in the development of the embryo, in longitudinal 
section ; x 600. The order of the transverse divisions is indicated by the lettering. 
The embryo shown in Fig. 33 had the terminal cell divided into four. 
Fig. 36. A young embryo in which the second wall (2) in the terminal cell was 
oblique, instead of being formed at right angles to the first one. 
Figs. 37, 38. Two sections of an older embryo. 
PLATE III. 
Fig. 39. A somewhat advanced embryo, seen in median section, showing the 
enlarged suspensor-cell with its nucleus. The limits of the first transverse walls 
are still visible. 
Fig. 40. A similar section of an older embryo, showing the first trace of the 
Stem-apex, si., and the root, r. 
Fig. 41. A still older embryo, showing the strongly lateral position of the 
primary root, r. ; si., stem-apex ; cot., cotyledon. 
Fig. 42. Section of an embryo from a nearly ripe seed ; x 100. 
Fig. 43. The basal part of a similar embryo ; x 350. 
Fig. 44. Three transverse sections of a young embryo ; x 350 \ a is a section 
just above the suspensor, and shows several of the endosperm-nuclei. 
