- 216 BOTANICAL GAZETTE [SEPTEMBER 
Fic. 50.—Longitudinal section of proembryo with four-celled embryo; 
X 150. 
Fic. 51.—Outline of longitudinal section of endosperm with inclosed 
embryo of a young seed, taken from young berry about the size of berry A 
in fig. 66; X26. 
Fig. 52.—Outline of longitudinal section of endosperm with embryo 
from mature seed, showing distribution of oil globules; 17.5. 
Fic. 53.—Portion of longitudinal section of endosperm from mature seed 
taken at B in fig. 52; X150 
Fic. 54.—Portion of longitudinal section of endosperm from mature 
seed taken at A in fig. 52; X150. 
Fic. 55.—Portion of longitudinal section of germinating seed taken in 
region C in fig. 52; cl, cells abundantly supplied with chloroplasts; cs, cells 
containing cystoliths of calcium oxalate, starch, and small quantities of chloro- 
plast; 2, cells filled with starch; e, cells filled with protein-like substances; 
ct, cells of cotyledons of embryo; 150 
Fic. 56.—Part of longitudinal section of carpel taken at O in fig. 20, 
showing cells (vi) which give rise to viscin; X150. : 
Fics. 57-59.—Portions of cells of viscin from ripe seed; 150 
1G. 60.—Longitudinal section of micropylar end of embryo sac of D. 
gracile, showing fusion of polar nuclei; X 150. 
1G. 61.—Longitudinal section of micropylar end of embryo sac of D. 
gracile, showing nucleus (d) formed by fusion of polar nuclei; disintegration 
of egg and synergid just beginning; 1 50 ; 
Fic. 62.—Same as fig. 61, with fusion nucleus (d) of D. gracile preparing 
to divide; synergids and egg disintegrating; 150. 
Fic. 63.—Division of fusion nucleus of D. gracile: probably displaced 
downward, from about level A, by fixation; the synergids and egg are dis- 
integrating; x 250. 
Fic. 64.—Two-celled embryo of D. gracile: synergids have disappeared; 
egg disintegrating; 1 50. : 
Fic. 65.—Portion of longitudinal section of proembryo of D. gracile, 
which was composed of about 16 cells; 150. 
Fic. 66.—Lateral view of spike with berries in various stages of develop- 
ment; also showing position of endosperm and embryo in relation to the system 
of arrangement of different members of plant; B, flower in which formation 
of proembryo has just begun; X2.8. 


