372 BOTANICAL GAZETTE [may 



Fig. ii. — First division of fertilized egg: a second sperm has entered and 

 is dividing in the upper part of the egg; two more sperms which have almost 

 entered the egg are seen at the top; X42. 



Fig. 12. — The fourth simultaneous free nuclear division; X42. 



Fig. 13. — At the bottom, 8 approximately equal nuclei are dividing; at 

 the top, the division is also simultaneous, but the number of nuclei is large 

 and they are irregular in size; there is a very marked polarity; X42. 



Fig. 14. — The nuclei of the lower half are large and are in the resting 

 condition, while those of the upper half are smaller and are dividing simul- 

 taneously; the polarity is evident; X42. 



Fig. 15. — Evanescent segmentation: the nuclei of the lower part are 

 larger and the cytoplasm is becoming vacuolated; X42. 



Fig. 16. — Many nuclei have migrated to the bottom and the cytoplasm 

 of the entire proembryo is vacuolated; the ciliated band is still evident at the 

 top; X42. 



Fig. 17. — Slightly later stage: many nuclei have amoeboid shapes; X42. 



Fig. 18. — Nuclei with dense cytoplasm at the base of the proembryo, 

 just before the second free nuclear period; X 140. 



Fig. 19. — Free nuclear division of the second free nuclear period; X140. 



Fig. 20. — Segmentation at the close of the second free nuclear period; 

 X 140. 



Fig. 21. — The cellular region is differentiated from the free nuclear region 

 and there is some differentiation within the cellular region itself; X 100. 



Fig. 22. — An outer layer of dermatogen-like cells has been differentiated; 

 the dense cells just above are to produce the periblem, the plerome, and most 

 of the suspensor; X 100. 



Fig. 23. — The upper cells of the cellular region are distinctly haustorial, 

 and the slender tip, which has just broken through the egg membrane, is 

 composed largely of haustorial cells; X 100. 



Fig. 24. — Photomicrograph: upper part of fertilized egg, showing a part 

 of the ciliated band and two sperms which have almost entered the egg; X80. 



Fig. 25. — Photomicrograph: first mitosis in fertilized egg, showing the 

 mototic figure and the conspicuous kinoplasmic area about it; XS6. 



Fig. 26. — Photomicrograph: one of the mototic figures of the fourth 

 simultaneous free nuclear division; X517. 



Fig. 27. — Proembryo, showing the migration of nuclei toward the bottom; 

 X33- 



