xiv TABLE OF CONTENTS 



LESSON VI. 



PAGE 



A COMPARISON OF THE FOREGOING ORGANISMS WITH CERTAIN 

 CONSTITUENT PARTS OF THE HIGHER ANIMALS AND 

 PLANTS 56 



ANIMAL AND PLANT CELLS 56 



MINUTE STRUCTURE AND DIVISION OF CELLS AND 



NUCLEI 62 



OVA OF ANIMALS AND PLANTS 68 



LESSON VII. 



SACCHAROMYCES 71 



LESSON VIII. 



BACTERIA 82 



LESSON IX. 



BIOGENESIS AND ABIOGENESIS 95 



HOMOGENESIS AND HETEROGENESIS IO2 



LESSON X. 



PARAMCECIUM j IO6 



STYLONYCHIA /. Il6 



OXYTRICHA 120 



LESSON XI. 



OPALINA 121 



LESSON XII. 



VORTICELLA 126 



ZOOTHAMNIUM 135 



