660 Wisconsin Academy of Sciences, Arts, and Letters. 
X 
Figure 44. The lower end of the same embryo-sac as shown in 
Fig. 43. The other nucleus of the sac is shown in the 
figure above. A large cell of the nucellar wall is seen 
immediately below the embryo-sac with remains of 
other cells which have degenerated. The nucellar 
wall has been reduced to a single layer of cells. 
Figure 45. A view of the microplylar end of a nucellus show¬ 
ing three of the embryo-sac nuclei and a large nucel¬ 
lar cell of the inner layer which has resisted degenera¬ 
tion. 
Figure 46. A fully formed embryo-sac with two cells of the 
nucellus separated from the nucellar wall and lying 
near the embryo-sac. 
Figure 47. iSTucellar cells persisting at the apex of the embryo- 
sac. 
Figure 48. The embryo-sac nuclei degenerating while a nucel¬ 
lar cell is dividing. 
Figure 49. The next section of the same nucellus showing an¬ 
other nucellar cell which seems to be healthy and nor¬ 
mal. The endospern nuclei not yet fused. 
Figure 50. An embryo formed from one of the dividing nucel¬ 
lar cells. Endosperm nucleus seen above it. 
Figure 51. A flat aggregation of cells at the micropyle. 
Figure 52. A section remote from the above represented Fig. 
51 but in the same nucellar cavity. The embryo 
here is quite clearly from one cell. 
Figure 53. Two rudimentary embryos lying close together in 
the micropylar region. 
Figure 54. Two embryos in the micropylar region. One still 
a single cell in stages of division. 
Figure 55. Two embryos much similar to those in Fig. 53. 
Figures 56 and 57. Two successive sections in the micropylar 
region of a nucellus, showing three and probably four 
young embryos. 
Figure 58. Three well-formed embryos in the micropylar re¬ 
gion. The inner integument is shown. 
Figure 59. Three large embryos in a seed in which endosperm 
is nearly all formed. 
