22 BOTANICAL GAZETTE [JANUARY 
FiG. 75. Embryo sac into which two vei tubes have entered, showing 
course of tube and mode of entrance into sa 
1G. 76. Division of fertilized egg. an nucleus still in resting 
condition 
1G. 77. Division of primary endosperm nucleus in embryo sac with two- 
cp nae 
G. 78. Two-celled embryo with lower nucleus in division, 
“te 79. Four-celled proembryo. 
Fie. 80. The end cell of embryo has divided by a vertical wall. 
Fic. 81. Embryo with enlarged synergid. 
Fic. 82. Later stage in development of embryo showing greatly enlarged 
vesicular cell. 
Fic. 83. Diagram of longitudinal section of embryo from nearly ripe 
seed. Flattened vesicular cell at root end, lateral stem tip, and secondary 
roots from near base of stem. 
