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 



