XVI CONTENTS 



PAGE 



(a) Sexual Affinity in general ...... 301 



(b) More minute discussion of Sexual Affinity, and its 



different gradations ...... 305 



a. Self-fertilisation ....... 306 



/3. Bastard Formation, or Hybridisation . . . 310 



y. The Influence of Environment upon Sexual Affinity 313 



5. Recapitulation and Attempted Explanations . . 316 



Literature ............ 320 



CHAPTER VIII. 



Metabolic Changes occurring between Protoplasm, Nucleus and Cell 



Products 323 



I. Observations on the Position of the Nucleus, as an indication of its 



participation in Formative and Nutritive Processes . . . 324 



II. Experiments proving Reciprocal Action of Nucleus and Protoplasm 330 



Literature 332 



CHAPTER IX. 



The Cell as the Elementary Germ of an Organism. Theories of 



Heredity . 334 



I. History of the older Theories of Development . 

 II. More Recent Theories of Roproduction and Development 



III. The Nucleus as the Transmitter of Hereditary Elemental Germs . 



1. The Equivalence of the Male and Female Hereditary Masses 



2. The equal Distribution of the Multiplying Hereditary Mass 



3. The Prevention of the Summation of the Hereditary Mass . 



4. Isotropy of Protoplasm 



IV. Development of the Elemental Germs ...... 



Literature ............ 



Iudex 363 





