CONTENTS xiii 



PAGE 



for the Transmissibtlity of Modifications. § 9. Particular Evi- 

 dence in support of the Affirmative Answer. § 10. As regards 

 Mutilations and the Like. § 11. Brown-Sequard's Experiments 

 on Guinea-pigs. § 12. Negative Evidence in favour of the Affirma- 

 tive Answer. § 13. The Logical Position of the Argument. § 14. 

 Indirect Importance of Modifications. § 15. Practical Con- 

 siderations. 



CHAPTER VIII 

 HEREDITY AND DISEASE 250 



§ I. Health and Disease. § 2. Misunderstandiyigs in regard 

 to the " Inheritance " of Disease. § 3. Are Acquired Diseases 

 transmissible ? § 4. Can a Disease be transmitted ? § 5. Pre- 

 dispositions to Disease. § 6. Particular Cases. § 7. Defects, 

 Multiplicities, Malformations, and other Abnormalities. § 8. 

 Some Provisional Propositions. § 9. Immunity. § 10. Note on 

 Chromosomes in Man. § 11. Practical Considerations. 



CHAPTER IX 

 STATISTICAL STUDY OF INHERITANCE .... 309 



§ I. Statistical and Physiological Inquiries. § 2. Historical 

 Note. % ^. A Hint of the Statistical Mode of Procedure. § 4. 

 Filial Regression. § 5. Law of Ancestral Inheritance. § 6. 

 Illustration of Results reached by Statistical Study. § 7. Applica- 

 tion to Individual Cases. § 8. Statistical and Physiological Laws. 



CHAPTER X 

 EXPERIMENTAL STUDY OF INHERITANCE .... 336 



§ I. Mendel's Discoveries. § 2. Theoretical Interpretations. 

 § 3. Elaborations. § 4. Illustrations of Mendelian Inheritance. 

 § 5. Mendel's Discovery in Relation to Other Conclusions. § 6. 

 Practical Importance of Mendel's Discovery. § 7. Other Experi- 

 ments on Heredity. § 8. Consanguinity. 



CHAPTER XI 

 HISTORY OF THEORIES OF HEREDITY AND INHERITANCE . 395 



§ I . What is required of Theories of Heredity and Inheritance. 

 § 2. The Old Theories of Heredity. § 3. Theories of Pangenesis. 

 § 4. Theory of Genetic or Germinal Continuity. 



