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 69 



LESSON VII. 



SACCHAROMYCES 7 1 



LESSON VIII. 



BACTERIA 82 



LESSON IX. 



BIOGENESIS AND ABIOGENESIS 95 



HOMOGENESIS AND HETEROGENESIS 1O2 



LESSON X. 



PARAMCECIUM IO6 



STYLONYCHIA "6 



OXYTRICHA , 120 



LESSON XI. 



OPALINA I21 



LESSON XII. 



VORTICELLA . , 126 



ZOOTHAMNIUM ; X 35 



