TABLE OF CONTENTS 



INTRODUCTION 



PAGE 



LIST OF FIGURES . . . xv 



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 12 



CHAPTER I 

 GENERAL SKETCH OF THE CELL 



A. General Morphology of the Cell 14 



B. Structural Basis of Protoplasm . . . . . . . . . .17 



C. The Nucleus 22 



1. General Structure 23 



2. Finer Structure of the Nucleus 27 



3. Chemistry of the Nucleus 28 



D. The Cytoplasm 29 



E. The Centrosome ............. 3 



F. Other Cell-organs -37 



G. The Cell-membrane 3& 



H. Polarity of the Cell 3 8 



I. The Cell in Relation to the Multicellular Body 41 



Literature, I. 43 



CHAPTER II 



CELL-DIVISION 



A. Outline of Indirect Division or Mitosis . 47 



B. Origin of the Mitotic Figure 53 



('. Modifications of Mitosis 57 



1. Varieties of the Mitotic Figure 57 



2. Heterotypical Mitosis . 60 



3. Bivalent and Plurivalent Chromosomes OI 



4. Mitosis in the Unicellular Plants and Animals 62 



5. Pathological Mitoses 7 



I). The Mechanism of Mitosis 7 



1. Function of the Amphiaster . . . . -7 



(<?) Theory of Fibrillar Contractility ....> 7 



(//) Other Theories 



2. Division of the Chromosomes .... 77 



