TABLE OF CONTENTS 



PAGE 

 PREFACE TO THE FIRST EDITION • V 



PREFACE TO THE THIRD EDITION xi 



LIST OF ILLUSTRATIONS xix 



LESSON I. 



AMCEBA I 



LESSON IL 



H^MATOCOCCUS 23 



LESSON in. 



HETEROMITA 36 



LESSON IV. 



EUGLENA , . 44 



LESSON V. 



PROTOMYXA AND THE MYCETOZOA 49 



