1908] COULTER—GNETUM GNEMON 49 
Fic. 3.—Further development of pavement tissue; vacuolation of the sac. 
X 250. 
Fic. 3a.—An ovule, showing general relation of regions shown in fig. 3; the 
tip of the nucellus has broken down (the only indication of a pollen chamber). 
X40. 
Fic. 4.—Further pie Se of pavement tissue and embryo sac (probably 
fertilization stage). 220. 
Fic. 4a.—An eek showing relation of regions shown in fig. 4. X40 
Fic. 5.—Later stage of embryo sac (possibly still in patra at ‘ike’: with 
grouping of nuclei in the antipodal region, where tissue formation probably 
begins; beginning of disorganization of pavement tissue. X2TOo. 
Fic. 5¢.—An ovule, showing relation of regions shown in fig. 5; also the 
curious deotguatabean of cells and infolding of the epidermis in te nucellar 
beak. X4o ; 
Fic. 6.—Tip of seed; small amount of tissue of nucellar beak not destroyed 
by endosperm; differentiation of central and peripheral regions of endosperm, 
the former having advanced into the center of the nucellar beak and spread 
laterally, resulting in crushing nucellar tissue against the encroaching peripheral 
region of endosperm; sections of two suspensors shown. X 40 
FG. 6a.—Mature seed invested by the fleshy ‘“‘perianth;” outer integument 
differentiated into outer fleshy (white) and stony (black) layers; inner integu- 
ment forming the micropylar tube; at apex of nucellus is Figg the remains 
of the nucellar tissue (shown with greater magnification in fig. 6). 
Fic. 7.—A proembryo, showing the branching, suspensor-like ce of 
the egg, with free nuclei and cleavage walls; also the embryonal cell containing 
a nucleus and numerous starch grains; sections of other suspensors shown, 
and also a small portion of the undestroyed tip of the nucellus. X 4o. 
: IG. 74.—Outline to show the relation of parts illustrated by fig. 7. X3. 
Fic. 8.—Beginning of embryo formation by the embryonal cell, showing free 
nuclei and the beginning of a cleavage wall; a cleavage wall in the suspensor 
also shown. X 250. 
IG. 9.—Section of later stage of embryo, showing free nuclei, cleavage 
walls, and the beginning of small-celled tissue at one side. 2TOo. 
Fic. 10—An embryo reconstructed from serial sections, showing free nuclei, 
cleavage walls, and the beginning of uninucleate cells. <140. 
