xiv CONTENTS 



CHAPTER XXVI Page 



Historical Sketch 422 



Discovery of the cellular organization of plants and animals — Preformation 

 and epigenesis — Renewal of study of organic structure — Cell theory — Cell 

 multiplication — Protoplasm doctrine — Organismal theory — Syngamy and 

 embryogeny — Mitosis and meiosis — Cytology and heredity — The twentieth 

 century. 



Bibliography 449 



Index 533 



