EGG-SECRETIONS OF ARBACIA AND ASTERIAS. 385 



This would not follow even if it were shown that the retardation 

 is the result of depressed oxidation. It is possible however that 

 egg-secretion, at the moment of fertilization differs qualitatively 

 from the earlier secretion, and contains the real antagonists 

 whose inhibitory effect need not necessarily be thought of as 

 having been direct. 



15. These suggestions together with the facts upon which they 

 are based, are not necessarily out of harmony with existing 

 prominent theories of fertilization. 



UNIVERSITY OF MICHIGAN, 

 December 20, 1913. 



LITERATURE. 



Loeb, Jacques. 



'98 tiber den Einfluss von Alkalien und Sauren auf die Embryonale Entwick- 



lung und das Wachstum. Arch. f. Entwick. mech., 16. 

 Lillie, R. S. 



'09 On the Connection between Changes of Permeability and Stimulation, and 

 on the Significance of Changes in Permeability to Carbon Dioxide. Amer. 

 Journ. Physiol., 24. 

 McClendon, J. F. 



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

 Lillie, R. S. 



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

 Loeb and Wasteneys. 



'n Sind die Oxidationsvorgange die unabhangige Variable in den Lebenser- 



scheinungen? Biochem. Zeitschr., XXXVI. 

 Lillie, F. R. 



'I2 1 The Production of Sperm Iso-Agglutinins by Ova. Science, XXXVI. 

 LUlie, R. S. 



} I2 2 Antagonism between Salts and Anaesthetics. Am. Journ. Physiol., Vol. 



29. 

 Lillie, F. R. 



'I3 1 Studies of Fertilization V. Journ. Exp. Zool., 14. 

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

 Glaser, Otto. 



'i3 3 On Inducing Parthenogenesis in the Sea Urchin (Arbacia punctulata) 

 together with considerations on the Initiatory Effect of Fertilization. 

 Science, XXXVIII. 

 Elder, J. C. 



'i3 4 The Relation of the Zona Pellucida to the Formation of the Fertilization 



Membrane. Arch. f. Entwick. mech., 36. 

 Lillie, R. S. 



'i3 5 The Role of Membranes in Cell-Processes. Pop. Sci. Mo., 1913. 

 Loeb, Jacques. 



'i3 6 Artificial Parthenogenesis and Fertilization. Chicago, 1913. 



