TABLE OF CONTENTS 



XUl 



E. Reduction in Unicellular Forms . 



F. Divergent Accounts of Reduction 



I. formation of Tetrads by Conjugation 



G. Maturation of Parthenogenetic Eggs 

 H. Summary and Conclusion 



Appendix ..... 



1. Accessory Cells of the Testis , 



2. Amitosis in the Early vSex-cells 

 Literature, V 



CHAPTER VI 



Some Problems of Cell-Organization 



The Nature of Cell-organs 

 Structural Basis of the Cell . 

 I. Nucleus and Cytoplasm 

 Morphological Composition of the Nucleus 

 I. The Chromatin .... 



(rt) Hypothesis of the Individuality of 

 (/>) Composition of the Chromosomes 



Chromatin, Linin, and the Cytoret 



The Centrosome . 



The Archoplasmic Structures 



1. Asters and Spindle 



2. The Attraction-sphere 

 Summary and Conclusion 



culum 



the Chromosomes 



A. 

 B. 



C. 



D. 

 E. 

 F. 



Literature, VI. .... 



CHAPTER VII 

 Some Aspects of Cell-Chemistry and Cell-Physiology 



A. Chemical Relations of Nucleus and Cytoplasm 



1. The Proteids and their Allies 



2. The Nuclein Series .... 



3. Staining-reactions of the Nuclein Series 



B. Physiological Relations of Nucleus and Cytoplasm 

 Experiments on Unicellular Organisms 

 Position and Movements of the Nucleus 

 The Nucleus in Mitosis 

 The Nucleus in Fertilization 

 The Nucleus in Maturation 



C. The Centrosome . . . ■ 



D. Summary and Conclusion 



I. 



2. 



3- 

 4- 



5- 



Literature, VII. 



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CHAPTER VIII 

 Cell-Division and Development 



A. Geometrical Relations of Cleavage-forms .... 



B. Promorphological Relations of Cleavage .... 



1. Promorphology of the Ovum . . . • • 



(a) Polarity and the Egg-axis .... 

 {b) Axial Relations of the Primary Cleavage-planes 

 \c~) Other Promorphological Characters of the Ovum 



2. Meaning of the Promorphology of the Ovum . 



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