TABLE OF CONTENTS 
XXXIII. Experiments on Artificial Parthenogenesis in 
Annelids (Chzetopterus) and the Nature of the 
Process of Fertilization 
XXXIV. On an Apparently New Form of Muscular Irrita- 
XXXY. 
XXXVI. 
XXXVII. 
XXXVIII. 
INDEX 
bility (Contact-Irritability?) Produced by Solu- 
tions of Salts (Preferably Sodium Salts) Whose 
Anions Are Liable to Form Insoluble Calcium 
Compounds 
The Toxic and the Antitoxic Effects of Ions as a 
Function of Their Valency and Possibly Their 
Electrical Charge 
Maturation, Natural Death, and the Prolongation 
of the Life of Unfertilized Starfish Eggs 
(Asterias Forbesii) and Their Significance for 
the Theory of Fertilization 
On the Production and Suppression of Muscular 
Twitchings and Hypersensitiveness of the Skin 
by Electrolytes 
On the Methods and Sources of Error in the 
Experiments on Artificial Parthenogenesis 
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