38 BOTANICAL GAZETTE [JANUARY 
Fic. 31.—The formation of walls and elongation of suspensors before the 
cap cells have begun to elongate or have completed wall formation; 250. 
IG. 32.—Wall formation and elongation in the cap cells hefore either 
elongation or wall formation has begun in the suspensors; a small part of the 
membrane that sometimes forms above or even around the proembryo is 
shown at the upper right of the figure; 
Fics. 33 and 34.—A proembryo cut full ane showing all its parts after 
the elongation of the suspensors has begun; fig. 33 shows the expanded top 
of the suspensors crowded up against the neck of the archegonium; the arche- 
gonium jacket membrane is much stretched but has not broken nor has the 
neck been ruptured; fig. 34 shows the suspensors and the progress of destruction 
of the cells of the gametophyte; X62. 
Fic. 35.—Tip of a proembryo, showing the bottom of the suspensors, 
the group of embryo-forming cells, and the cap; note that the embryo is not 
properly a tiered one, and that the cell contents of the three regions are exceed- 
ingly similar; the walls of the cap cells are also seen not to be specially thicker 
or otherwise prepared for mechanical penetration; X 250. 
Fic. 36.—Three proembryos in competition for the favored position in the 
endosperm; the multinucleate condition of some of the endosperm cells is 
also shown; the fine grains in these cells are starch and the large light colored 
patches are vacuoles; X62. 
Fic. 37.—The struggle for supremacy during which the proembryos coil 
around one another and greatly erode the gametophyte; X 20. 
Fic. 38.—The beginnings of growth in the embryonic group of cells; the 
suspensor cells lose their oie and become distended, and the cap cells 
—~ ae degenerate; X17 
39.—Further cue in the embryo group: the cap has been crushed 
Es is gibas thrust to one side; cell division is more rapid in the tip region of 
the future embryo, while the upper cells are beginning to elongate, foreshadow- 
ing the production in that region of the secondary suspensor; a few cells of the 
primary suspensor are shown at the top; X 250. 
Fic. 40.—The secondary suspensors pushing the meristematic apex deep 
into the endosperm; note the massive ipreneigc of the secondary suspensor 
when rage with the slender primary o 
Fic. 41.—A later stage when the ae region has become large; 
the tical aon of the body regions shown in the next figure will follow 
shortly after the stage shown in this figure; X 20. 
IG. 42.—An embryo just after all the main body regions have been 
differentiated; x7. 
IG. 43.—Transverse section through the hypocotyl of a nearly mature 
embryo, showing the vascular ring, resin ducts, and cells crowded full of starch 
and proteids; X15. 
Fic, 44.—Section through the cotyledons; X15. 
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