﻿BOTANICAL GAZETTE 



Fig. ii.— First division of fertilized e 

 is dividing in the upper part of the egg; 

 entered the egg are seen at the top; 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 



Fig. 17— Slightly later stage: many nucl 

 Fig. 18. — Nuclei with dense cytoplasm 



Fig. 19— Free nuclear division of the second free nuclear period; Xi4°- 

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



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

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



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; Xioo. 



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 



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

 simultaneous free nuclear division; X 517. 



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

 X33- 



