TfXT-m. VIII. i a, b. Two successive sections cut through mature embryo sac of Godetia sp . (for reconstruction 
place ^ above a) 2. Ripe embryo sac of Gaura Lindheimeri. 3. The same of Gaura parvijlora. 4. The same of 
iLptlobium angiistifohum. 5. Circaeaquadrisulcata. 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 , 6, 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 mother-cell. 10. Immature sac of Ludwigia prostrata , with binucleate 
sister megaspore at the lower end. 11. The same, mature sac. All figs, x 890. 
Ishikawa.—Studies on the Embryo Sae and Fertilization in Oenothera. April, 1918. 
