TABLE OF CONTENTS 



INTRODUCTION 



PAGE 



List of Figures xvii 



Historical Sketch of the Cell-theory; its Relation to the Evolution-theory. Earlier 

 Views of Inheritance and Development. Discovery of the Germ-cells. Cell- 

 division, Cleavage, and Development. Modern Theories of Inheritance. Lamarck, 



Darwin, and Weismann ........... i 



Literature ............... 14 



CHAPTER I 

 General Sketch of the Cell 



A. General Morphology of the Cell .......... 19 



B. Structural Basis of Protoplasm .......... 23 



C. The Nucleus ............. 30 



1. General Structure . . . . . . . . . . -31 



2. Finer Structure of the Nucleus . . . . . . . , -37 



3. Chemistry of the Nucleus .......... 41 



D. The Cytoplasm ............. 41 



E. The Centrosome ............. 50 



F. Other Cell-organs ............. 52 



G. The Cell-membrane ............ 53 



H. Polarity of the Cell 55 



I. The Cell in Relation to the Multicellular Body 58 



Literature, I. 61 



CHAPTER II 

 Cell-division 



A. Outline of Indirect Division or Mitosis 



B. Origin of the Mitotic Figure 



C. Details of Mitosis 



1. Varieties of the Mitotic Figure 



(a) The Achromatic Figure 

 (^) The Chromatic Figure 



2. Bivalent and Plurivalent Chromosomes 



3. Mitosis in the Unicellular Plants and Animals 



4. Pathological Mitoses ..... 



65 

 72 



77 



78 



78 

 86 



87 

 88 



97 



xni 



