AUTO-PARTHENOGENESIS IN ARBACIA AND ASTERIAS. 409 



construct an hypothesis of fertilization in which the basal facts 

 of the surface-alteration theory, as well as the facts emphasized 

 by the fertilizin theory may, without violence to our knowledge, 

 find a place. From the standpoint here adopted, there is no 

 antagonism between the two theories which emphasize different 

 groups of facts associated with the process of fertilization. These 

 facts cannot be in conflict with one another. 



UNIVERSITY OF MICHIGAN, 

 January 10, 1914. 



LITERATURE. 

 Loeb, Jacques. 



'n On the Fertilizing Effect of Foreign Blood Serum upon the Egg of the 



Sea-Urchin. Proceed. Path. Soc. Phila., 1911. 

 Lillie, R. S. 



'n The Physiology of Cell-Division. Amer. Journ. Physiol., XXVII. 

 McClendon, J. F. 



'09 On Artificial Parthenogenesis of the Sea-Urchin Egg. Science, XXX. 

 Lillie, F. R. 



'12 The Production of Iso-Agglutinins by Ova. Science, XXXVI. 

 Glaser, Otto. 



'I3 1 On Inducing Development in the Sea-Urchin (Arbacia punctulata) to- 

 gether with Considerations on the Initiatory Effect of Fertilization. 

 Science, XXXVIII. 

 Lillie, F. R. 



'i3 2 Studies of Fertilization, V. Journ. Exp. Zool., 14. 

 '13' The Mechanism of Fertilization. Science, XXXVIII. 

 Loeb, Jacques. 



'i3 4 Artificial Parthenogenesis and Fertilization. Chicago, 1913. 

 Glaser, Otto. 



'I4 1 The Change in Volume of Arbacia and Asterias Eggs at Fertilization. 



BIOL. BULL., Vol. XXVI. 



'i4 2 A Qualitative Analysis of the Egg-Secretions and Extracts of Arbacia and 

 Asterias. BIOL.. BULL, Vol. XXVI. 



