TABLE OF CONTENTS 



Xlll 



XXXIII. Experiments on Artificial Parthenogenesis in 

 Annelids (Chsetopterus) and the Nature of the 

 Process of Fertilization 



XXXIV. On an Apparently New Form of Muscular Irrita- 

 bility (Contact-Irritability?) Produced by Solu- 

 tions of Salts (Preferably Sodium Salts) Whose 

 Anions Are Liable to Form Insoluble Calcium 

 Compounds 



XXXV. The Toxic and the Antitoxic Effects of Ions as a 

 Function of Their Valency and Possibly Their 

 Electrical Charge 



XXXVI. 



XXXVIII. On the Methods and Sources of Error in the 

 Experiments on Artificial Parthenogenesis 



646 



692 



708 



Maturation, Natural Death, and the Prolongation 

 of the Life of Unfertilized Starfish Eggs 

 (Asterias Forbesii) and Their Significance for 

 the Theory of Fertilization 728 



XXXVII. On the Production and Suppression of Muscular 

 Twitchings and Hypersensitiveness of the Skin 

 by Electrolytes 748 



766 



INDEX 



773 



