CONTENTS. 1x 
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 Progressive Transmission by In- 
heritance.—Laws of Conservative Transmission: Transmission of 
Inherited Characters.—Uninterrupted or Continuous Transmission. 
—Interrupted or Latent Transmission.—Alternation of Generations. 
—Relapse. — Degeneracy. — Sexual Transmission. — Secondary 
Sexual Characters. — Mixed or Amphigonous 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).— 
Homotopic Transmission (Identity in Part).— Adaptation and 
Matability—Connection between Adaptation and Nutrition.—Dis- 
tinction between Indirect and Direct Adaptation ... Bre ... 208 
CHAPTER X. 
LAWS OF 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 
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 
