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space within the testa. The final shape is prepared for very early
by two processes. The one is a curvation of the ovule (see
Fig. 1. Salsola Kali; c, embryo sac; a, b, d, ovary cavity with ovule, respecti-
vely on embryo sac mother cell, 8-nuclear embryo sac, and 2-cell-embryo stage (a
and c x 440, b x 300, d «130; the straight lines stand each for 0,1 mm).
figure a, b, and HEGELMAIER’S, pl. IV, fig. 10), the other is a bending
over of the curved ovule so that its median plane, at first longitu-
dinal to the ovary, becomes finally transversal. As to the causes
of these processes, it is at first to be remarked that the section
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