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 3° 



1. General Structure . . . . , . . . . . . 31 



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



3. Chemistry of the Nucleus . 41 



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



E. The Centrosome ............. 5° 



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 P^igure 

 (d) 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 



