X TABLE OF CONTENTS 



CHAPTER VI 



PAGE 



The Segregation of the Germ Cells in Nematodes, 



Sagitta, and Other Metazoa . . .174 

 1. The Keimbahn in the Nematodes, 174. 2. The 

 Keimbahn in Sagitta, 179. 3. The Keimbahn in Other 

 Animals, 183. 



CHAPTER VII 



The Germ Cells of Hermaphroditic Animals . . 189 



CHAPTER VIII 



Keimbahn-Determinants and their Significance . 211 

 A. The Genesis of the Keimbahn-Determinants, 

 211 {a. Nuclear, 213 ; b, Cytoplasmic, etc., 224 ; c. Dis- 

 cussion, 228) . B. The Localization of the Keimbahn- 

 Determinants, 235. C. The Fate of the Keimbahn- 

 Determinants, 240. 



CHAPTER IX 



The Chromosomes and Mitochondria of Germ Cells 245 

 The Chromosome Cycle in Animals, 245. The Mito- 

 chondria of Germ Cells, 275. 



CHAPTER X 



The Germ-plasm Theory 290 



References to Literature 311 



Index of Authors 337 



Index of Subjects 341 



