CONTENTS.

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CHAPTER PAGE
Introduction 1
I. Structure of the MedusÆ 10
II. Fundamental Experiments 26
III. Experiments in Stimulation 37
IV. Experiments in Section of Covered-Eyed MedusÆ 65
V. Experiments in Section of Naked-Eyed MedusÆ 104
VI. Co-ordination 130
VII. Natural Rhythm 146
VIII. Artificial Rhythm 175
IX. Poisons 213
X. Star-Fish and Sea-Urchins 254

xii

JELLY-FISH, STAR-FISH, AND
SEA-URCHINS.

                                                                                                                                                                                                                                                                                                           

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