Index. 
xii 
PAGE 
Figures. sac. 12. Embryo sac cut at right angles to the one above, showing 
the whole of ocsphere and one of the synergids (Ishikawa) . . 282 
II. 1. Hybrid ‘pycnella*. Egg apparatus showing chondriosome-like 
structures in a fertilized egg-cell. 2. Oenothera nutans. Oosphere 
containing two lumps of chondriosome-like structures besides some 
starch grains (ISHIKAWA) .285 
III. 1. Two embryo sac mother-cells in synopsis. 2. Double axial rows 
of tetrads; the left one is disintegrating. 3. Micropylar and 
chalazal megaspores developing. 4. Two binucleate megaspores, 
one of which is partly attached on the curved side of the other. 
5. Upper megaspore contains two mitotic figures; the lower one is 
binucleate. 6. Two megaspores equally in binucleate condition ; 
one of the nuclei is left in the adjoining section. 7. Binucleate 
megaspore and the uninucleate sister one; the latter survives lying 
on the side of the former. 8. Upper megaspore in binucleate con¬ 
dition ; the middle one still survives. 9. Two excess sister mega¬ 
spores surviving. 10. Upper megaspore contains four nuclei in 
telophase; the lower one binucleate, though the nuclei are not 
shown in the figure, n. Mature embryo sac with binucleate sister 
megaspore, whose nuclei show a sign of disintegration. 12. Ripe 
embryo sac with three surviving megaspores, two of which are going 
to disintegrate. 13. Two embryo sacs lying one upon the other; 
the upper one is fertilized. 14. Two sacs lying side by side. 
15. Two sacs in axial row; the lower one is pressing the upper 
one. j6. Two sacs lying collaterally; portions of synergids are 
left in the next section. 17. One embryo sac is partly encircled by 
the lower half of the other; part of egg apparatus is in another 
section (Ishikawa).. facing 286 
IV. Twin embryo sacs of Oenothera nutans fertilized by Oe. pycnocarpa, 
both of which are attacked by pollen-tubes (Ishikawa) . . 291 
V. 1-4. Various stages of fusion of male and egg nuclei. 5,6. Fusing pole 
and male nuclei. 7. Disintegrating male nucleus perching upon 
polar. 8. Endosperm nucleus with two nucleoli of different size, 
that suggesting origin of each of them. 9, Prophase of division of 
endosperm nucleus; fourteen chromatic filaments are clearly differen¬ 
tiated. 10. Three male nuclei ; the upper is fusing with the egg 
nucleus, the second is in contact with the polar, while the third lies 
beneath the chromatic mass. 11. The egg nucleus uniting with 
two male nuclei. 12. The polar receiving another male element 
(Ishikawa) ..293 
VI. Section through plasma sheet with sixteen endosperm nuclei, showing 
two nucleoli in each of them (Ishikawa) . . . . . 294 
VII. 1. Open end of pollen-tube in synergid, lined with mucilaginous sub¬ 
stance. 2. Remainder of tube contents, with some liquid drops. 
3. Tip of pollen-tube after fertilization, showing mucilaginous layer 
lining apical portion. 4. Two synergids treated with cuprammonia, 
showing total disappearance of filiform apparatus (Ishikawa) . 298 
VIII. 1 a , b. Two successive sections cut through mature embryo sac of 
Godetia sp. 2. Ripe embryo sac of Gaura Lindheimeri. 3. The 
same of Gaura parviflora. 4. The same of Epilobium angustifolium. 
5. Circaea quadrisulcata. 6. Immature sac of Jussieua repens. 
7. The same cut at right angles to the preceding section. 8. Mature 
sac of the same; egg-cell is left in another section. 9 a, b, c. Three 
succeeding sections which show an axial row of three embryo sacs 
of Jussieua repens. The upper one is derived from a different 
mother-cell to the lower two, which are developed from the same 
