INDEX OF AUTHORS 



321 



Wilson (E. B.) and Mathews : sperm- 

 path, egg axis, first furrow, and 

 embryonic axes of Toxopneustes, 

 185, 249, 250. 



Windle : effect of magnetism and 

 electricity on development, 91. 



Wolff : epigenesis, 16. 



Yatsu : egg-fragments of Cerebratulus, 



207. 

 Yung : effect of light on tadpoles, 



etc., 94. 



Zeleny : egg-fragments of Cerebratulus, 



206, 207. 

 Zelinka : fertilization spindle in 



Callidina, 34. 



Ziegler : heterodynamic centro- 

 somes, 30. 



formation of micromeres in Cteno- 

 phora, 209, note. 



pressure experiments on eggs of 

 Echinoids and Ctenophora, 88, 

 186. 



fertilization of Diplogasttr, 34. 



egg and embryonic axes, 250. 

 Zoja : isolated blastomeres of Hydro- 

 medusae, 181, 182. 



animal and vegetative cells of 

 Strongylocentrotus, 193. 



Zur Strassen : segmentation of 

 Ascatis, 31. 



fusion of the eggs of Ascaris. 



JEJTK1NSON 



