XIV 



TARI.E OF COXIT.XTS 



1). The Mechanism of Mitosis ..... 



1. Funclion of ihc Ampliiaster 



(^(7) Theory of Fibrillar Contractility 

 {b) Other Facts and Theories 



2. Divisiiin of the Chromosomes 



E. Direct or Amitotic Division ..... 



1. General Sketch ...... 



2. Centrosome and Attraction-sphere in Amitosis 

 3- Biological Significance of .\mitosis 



F. Summary and Conclusion ..... 

 Literature, II. . 



PACE 

 lOO 

 lOO 

 lOO 



io6 



I 12 



114 



"4 



"5 

 ii6 



119 



121 



CHAPTER III 



The Germ-cells 



A. The Ovum 124 



1. The Nucleus . . . . . .125 



2. The Cytoplasm . . . . . . . . . . . .130 



3. The Egg-envelopes . . . . . . . . . . .132 



B. The Spermatozoon . . . . . . . . . . . .134 



1. The Flagellate Spermatozoon . . . . . . . . '135 



2. Other Forms of Spermatozoa ......... 142 



3. Paternal Germ-cells of Plants ......... 142 



C. Origin of the Germ-cells ........... 144 



D. Growth and Differentiation of the Germ-cells . . . . . . -150 



1. The Ovum . . . . . . . . . . . . .150 



(<2) Growth and Nutrition . . . . . . . . .150 



(b') Differentiation of the Cytoplasm. Deposit of Deutoplasm . -152 

 (t) Yolk-nucleus . . . . . . . . . . -155 



2. Origin of the Spermatozoon . . . . . . . . .160 



3. Formation of the Spermatozoids in Plants 1 72 



E. Staining-reactions of the Germ-nuclei . . . . . . . . -175 



Literature, III. 177 



CHAPTER IV 

 Fertilization of the Ovum 



A. General Sketch ...... 



1. The Germ-nuclei in Fertilization 



2. The Achromatic Structures in Fertilization 



B. Union of the Germ-cells 



1. Immediate Results of Union 



2. Paths of the Germ-nuclei 



3. Union of the Germ-nuclei. The 

 The Centrosome in Fertilization . 

 Fertilization in Plants . 

 Conjugation in Unicellular Forms 

 Summarv and Conclusion 



Chromosomes 



C. 

 D. 

 E. 

 F. 

 Literature, IV, 



180 

 igi 



185 

 196 

 200 

 202 

 204 

 208 



215 

 222 



229 

 231 



