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 ....... 67 



LESSON VII. 

 SACCHAROMYCES ........... ..... 70 



LESSON VIII. 



BACTERIA ................. gj 



LESSON IX. 



BIOGENESIS AND ABIOGENESIS ......... 93 



HOMOGENESIS AND HETEROGENESIS ...... ICO 



LESSON X. 



PARAMCECIUM ............... 



STYLONYCHIA ................. 



OXYTRICHA 



LESSON XI. 



OPALINA 



LESSON XII. 



VORTICELLA 



124 



ZOOTHAMNIUM 



