TABLE OF CONTENTS 
x 
PART II 
XVI. The Influence of Light on the Development of 
Organs in Animals 425 
XVII. Has the Central Nervous System Any Influence 
upon the Metamorphosis of Larvae? 436 
XVIII. On the Theory of Galvanotropism 440 
XIX. The Physiological Effects of Ions. I 450 
XX. Onthe Physiological Effects of Electrical Waves 482 
XXIJI. The Physiological Problems of Today 497 
XXII. The Physiological Effects of Ions. II 501 
XXIII. Why Is Regeneration of Protoplasmic Fragments 
without a Nucleus Difficult or Impossible ? 505 
XXIV. On the Similarity between the Absorption of Water 
by Muscles and by Soaps 510 
XXV. On Ions Which Are Capable of Calling Forth 
Rhythmical Contractions in Skeletal Muscle 518 
XXVI. On the Nature of the Process of Fertilization and 
the Artificial Production of Normal Larvee 
(Plutei) from the Unfertilized Eggs of the Sea- 
Urchin 539 
XXVII. On Jon-Proteid Compounds and Their Réle in the 
Mechanics of Life-Phenomena.—The Poison- 
ous Character of a Pure NaCl Solution 544 
XXVIII. On the Different Effects of Ions upon Myogenic 
and Neurogenic Rhythmical Contractions and 
upon Embryonic and Muscular Tissue 559 
XXIX. On the Artificial Production of Normal Larve from 
the Unfertilized Eggs of the Sea-Urchin 
(Arbacia) 576 
XXX. On Artificial Parthenogenesis in Sea-Urchins 624 
XXXI. Onthe Transformation and Regeneration of Organs 627 
XXXII. Further Experiments on Artificial Parthenogenesis 
and the Nature of the Process of Fertilization - 638 
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