SPERMATOPHYTES 
273 
/ 608 
FIGS. 604-608. The hypophysis in Capsella: 604, cell with nucleus is the cell of 
the filamentous proembryo next to the terminal one (which has formed most of the 
embryo); 605, division of this cell into hypophysis (cell next to the embryo) and end cell 
of suspensor (it is this division that finally differentiates embryo and suspensor); 
606, division of hypophysis into two cells; 607, division of the outer daughter cell of 
the hypophysis; 608, final product of the hypophysis (six cells visible, in three tiers), 
innermost tier completing the periblem (plerome shaded), middle tier (shaded) complet- 
ing the dermatogen (shaded), and outermost tier starting the root cap. After COULTER 
and CHAMBERLAIN. 
y- 
609 
610 
611 
612 
613 
FIGS. 600-613. Development of embryo of Sagittarm (a monocotyledon): 609, the 
three-celled filamentous proembryo, the terminal one (z) forming the cotyledon (sy, the 
undestroyed synergid) ; 610, the same; 611, division of middle cell; 612, 613, later 
stages; x, enlarged basal suspensor cell; y, middle cell; z, terminal cell. After 
SCHAFFNER. 
Among the Leguminosae there is often developed a conspicuous and 
very active suspensor, which may almost girdle the sac with its turgid cells. 
