CONTENTS 



PAGE 



CHAPTER i 

 Introduction I 



CHAPTER II 

 Historical Sketch 3 



CHAPTER III 

 The General Features of Endoplasmic Streaming 8 



CHAPTER IV 

 The Transformation of Endoplasm into Ectoplasm 18 



CHAPTER V 

 Pseudopods and the Nature of the Ectoplasm 25 



CHAPTER VI 

 The Species Question ' 41 



CHAPTER VII 

 Experiments on the Surface Layer of the Ameba 48 



CHAPTER VIII 

 On the Nature of the Surface Layer 63 



CHAPTER IX 

 The Surface Layer and Theories of Ameboid Movement ... 76 



CHAPTER X 

 Streaming, Contractility and Ameboid Movement 92 



CHAPTER XI 

 The Surface Layer as a Locomotor Organ 105 



CHAPTER XII 

 The Wavy Path of the Ameba 109 



CHAPTER XIII 

 The Wavy Path of the Ameba and the Spiral Paths of 



Ciliates and Other Organisms 126 



CHAPTER XIV 

 Conclusions 142 



Bibliography 146 



vii 



