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 .......■•.■•••• H 



CHAPTER I 



General Sketch of the Cell 



A. General Morphology of the Cell 19 



B. Structural Basis of Protoplasm 23 



C. The Nucleus 3° 



1. General Structure ......•.••• 3' 



2. Finer Structure of the Nucleus 37 



3. Chemistry of the Nucleus 4' 



D. The Cytoplasm 4' 



E. The Centrosome ........••••• 5° 



F. Other Cell-organs 5^ 



G. The Cell-membrane ......•••••• 53 



H. Polarity of the Cell 55 



I. The Cell in Relation to the Multicellular Body 5^ 



Literature, I. 01 



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 

 (l>) 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 



