THE PROBLEM OF ACTIVATION 271 



LOEB, JACQUES, AND BANCROFT, F. W. 



"The Sex of a Parthenogenctic Tadpole and Frog," 

 Jour. Ex p. Zool., XIV, 275-77. 



MCCLENDON, J. J. 



1912. " Dynamics of Cell Division. Artificial Partheno- 

 genesis in Vertebrates," Am. Jour, of Physlol., 

 XXIX, 298-301. 



MOORE, CARL R. 



1916. See references at end of chapter v. 



1917. See references at end of chapter v. 



MORGAN, T. H. 



1896. "The Production of Artificial Astrospheres," Arch, 

 fur Entwickelungsmech., Band 3, pp. 339-61. 



1900. "Further Studies on the Action of Salt Solutions 

 and of Other Agents on the Egg of Arbacia" Arch, 

 fur Entwickelungsmech., Band 10, pp. 489-524. 



RICHARDS, A., AND WOODWARD, A. E. 



1915. See references at end of chapter iv. 



ROBERTSON, T. B. 



19126. See references at end of chapter v. 



WILSON, E. B. 



1901. "Experimental Studies in Cytology: I, A Cytological 

 Study of Artificial Parthenogenesis in Sea-Urchin 

 Eggs," Arch, fur Entwickelungsmech., Band 12, pp. 

 529-96. 



WOODWARD, ALVALYN E. 



1918. "Studies on the Physiological Significance of Certain 

 Precipitates from the Egg Secretions of Arbacia and 

 Astcrias" Jour. Exp. Zool., XXVI, 459-502. 



