XVl 



TABLE OF CONTENTS 



C. 

 D. 



Physiological Relations of Nucleus and Cytoplasm 



1. ENi>crinuMits on I'liiccllular Organisms 



2. Position and Movements of the Nucleus 



3. The Nucleus in Mitosis 



4. The Nucleus in Fertilization 



5. The Nucleus in Maturation 

 The Centrosome ...... 



Summarv and Conclusion .... 



Literature, VIl. 



PAGE 



341 

 342 

 346 

 351 

 352 

 353 

 354 

 358 

 359 



CHAPTER VIl I 



CkLL-DIVISION and DliVEI.Ol'MENT 



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



B. Promorphological Relations of Cleavage .... 



1. Promorphology of the Ovum ..... 



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

 (J)) Axial Relations of the Primary Cleavage-planes 

 (<:) Other Promorphulogical Characters of the Ovum 



2. Meaning of the Promorphology of the Ovum 



C. Cell-division and tirowth ....... 



Literature, VIII 



362 

 378 

 378 

 378 



379 

 382 



384 

 388 

 394 



CHAPTER LX 

 Theories of Inheritance and Development 



A. The Theory of Germinal Localization 397 



B. The Idioplasm Theory 401 



C. Union of the Two Theories 4^3 



D. The Roux-Weismann Theory of Development 404 



E. Critique of the Roux-Wcismann Theory 407 



F. On the Nature and Causes of Differentiation 413 \J 



G. The Nucleus in Later Development 425 ■" 



H. The External Conditions of Development 428 



I. Development, Inheritance, and Metabolism 430 



J. Preformation and Epigenesis. The Unknown Factor in Development . . 431 ^ 



Literature, IX 434 



Glossary 437 



General Literature-list 449 



Index of Authors 47' 



Lndex of Subjects 477 



