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 CF TH-E 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. 6l 



CHAPTER II 

 CELL-DIVISION 



A. Outline of Indirect Division or Mitosis 65 



B. Origin of the Mitotic Figure 72 



C. Details of Mitosis 77 



1. Varieties of the Mitotic Figure 78 



(#) The Achromatic Figure 78 



(b) The Chromatic Figure 86 



2. Bivalent and Plurivalent Chromosomes 87 



3. Mitosis in the Unicellular Plants and Animals 88 



4. Pathological Mitoses 97 



xiii 



