1 1 



Observations of Wheeler, Mead, Wilson and 

 Mathews, and Bovarl (Jour. Morph., Vol. lo; 

 and Jour. Royal Mic. Soc, 1895, p. 433 ; Wil- 

 son, Atlas of the fertilization and karyokinesis of 

 the ovum, 1895). 



5. Phases of Ontogeny. 



i. /;/ iinicclhilaj' organisvis (See Hatschek, Zoologie, 

 pp. 56-60). 



Simple fission. 



Budding and development. 



ii. In multicellular organisms (See Hatschek, Zoolo- 

 gie, pp. 207-226). 



The cycle from egg to ^%g. 



Metamorphosis. 



Hermaphroditism. 



Sexual dimorphism. 



Secondary sexual characters. 



Polymorphism : 



Correlated with division of labor. 

 Associated with change of season. 



Regeneration of lost parts. 



Fission followed by regeneration. 



Fission preceded by regeneration. 



Budding. 



Alteration of generations, Chamisso. 



a. By fission. 



b. By budding. 



c. By parthenogenesis. 



d. By heterogeny. 



