CONTENTS. IX 



PAGE 



nogenesis. — Material Transmission of Peculiarities of both Parents 

 to the Child by Sexual Propagation. — Difference between Trans- 

 mission by Inheritance in Sexual and in Asexual Propagation ... 175 



CHAPTER IX. 



LAWS OF TRANSMISSION BY INHERITANCE. 

 ADAPTATION AND NUTRITION. 



Distinction between Conservative and Pr-ogressive Transmission by In- 

 heritance. — Laws of Conservative Transmission : Transmission of 

 Inherited Characters. — Uninten-upted or Continuous Transmission. 

 — Interrupted or Latent Transmission. — Alternation of Generations. 

 " — Relapse. — Degeneracy. — Sexual Transmission. — Secondary 

 Sexual Characters. — Mixed or Amphigonoua Transmission. — 

 Hybrids. — Abridged or Simplified Transmission. — Laws of Pro- 

 gressive Inheritance : Transmission of Acquired Characters. — 

 Adapted or Acquired Transmission. — Fixed or Established Trans- 

 mission. — Homochronous Transmission (Identity in Epoch) . — 

 nomotopic Transmission (Identity in Part). — Adaptation and 

 Mutability. — Connection between Adaptation and Nutrition. — Dis- 

 tinction between Indirect and Direct Adaptation ,., ,,. ... 203 



CHAPTER X. 

 LAWS OP ADAPTATION 



Laws of Indirect or Potential Adaptation. — Individual Adaptation. — 

 Monstrous or Sudden Adaptation. — Sexual Adaptation. — Laws of 

 Direct or Actual Adaptation. — Universal Adaptation. — Cumulative 

 Adaptation. — Cumulative Influence of External Conditions of Ex- 

 istence and Cumulative Counter-Influence of the Organism. — Free 

 Will. — Use and Non-use of Organs. — Practice and Habit. — Cor- 

 relative Adaptation. — Correlation of Development. — Correlation of 

 Organs. — Explanation of Indirect or Potential Adaptation by the 

 Correlation of the Sexual Organs and of the other parts of the 

 Body. — Divergent Adaptation. — Unlimited or Infinite Adaptation... 227 



r 



CHAPTER XI. 



NATURAL SELECTION BY THE STRUGGLE FOR EXISTENCE. 

 DIVISION OF LABOUR AND PROGRESS. 



Interaction of the two Organic Formative Causes, Inheritance and 

 Adaptation. — Natural and Artificial Selection. — Struggle for Ex- 

 istence, or Competition for the Necessaries of Life. — Disproportion 



