xiv TABLE OF CONTENTS 



LESSON VL 



FAGB 



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 vn. 



SACCHAROMYCES 7I 



LESSON vin. 



BACTERIA 82 



LESSON IX. 



BIOGENESIS AND ABIOGENESIS 95 



HOMOGENESIS AND HETEROGENESIS I02 



LESSON X. 



PARAMCECIUM 106 



STYLONYCHIA II6 



OXYTRICHA 120 



LESSON XL 



OPALINA 121 



LESSON xn. 



VORTICKLLA I26 



ZOOTHAMNIUM '35 



