1914I MARTIN— LEGUMINOSAE 155 



well distributed through the family. At that time the homology 

 between microsporangium and megasporangium had not been 

 established, and the terms "apical" and "subapical" were used to 

 designate the primary parietal and sporogenous cells. His account 

 shows that a one-celled archesporium prevails through the group. 

 The archesporial cell always cuts off one parietal cell, which may 

 remain undivided or produce a tissue varvine in amount. The 



may produce the emb 



form 



may function. The embry 



the antipodals are ephemeral. The fusion of the polar nuclei may 

 occur in the center of the sac, against the inner wall, or in con- 

 tact with the egg apparatus. The first division of the egg is trans- 



verse. 



may result in a massive proemb 



massive 



proemb 



cell. 



terminal embryo. In 1907 Saxton (7) described the embryo sac 



issia tomentosa, and found one deeply buried megaspore mother 

 The third megaspore out of the longitudinal row of 4 func- 

 tions; the polars fuse early; and the antipodals are persistent and 

 form an absorptive tissue which fills the tubular projection in the 

 chalazal region. 



In 191 2 Comptont (1) described the seedling structure of 201 

 species of Leguminosae, ranging through all the regions of the vast 

 family. He found the seedling epigeal in 

 but hypogeal in Vicia. 



Tri folium 



Material 



fixing 



best results; one-half of 1 per cent strength was most satisfactory. 



The heads of Trifolium were split and entire halves run through 



and sectioned. Since the head is a compact raceme, this method 



enables one to trace the development of the embryo sac more 



readily, and proved to be of valuable assistance in determining 



the sterility of ovules. Separate flowers of Medicago and Vicia 



were used. The sections were stained with safranin and gentian 

 violet. 



