CHAPTER VIII 



HEREDITY AND DISEASE 

 "Naturam expellas furca, tamen usque recurbet." HORACE. 



i. Health and Disease. 



2. Misunderstandings in regard to the "Inheritance" of 

 Disease. 



3. Are Acquired Diseases transmissible? 



4. Can a Disease be transmitted ? 



5. Predispositions to Disease. 



6. Particular Cases. 



7. Defects, Multiplicities, Malformations, and other Ab- 

 normalities. 



8. Some Provisional Propositions. 



Q. Immunity. 



10. Note on Chromosomes in Man. 

 ii. Anticipation and Intensification of Disease. 

 12. Practical Considerations. 



i. Health and Disease 



What is Disease ? The distinction between health and disease 

 is relative to an ideal the maximum efficiency and well-being of 

 the organism under given conditions ; and pathology, the science 

 of deranged function or disturbed metabolism deranged or dis- 

 turbed in comparison with what we call " normal " is, strictly 

 speaking, part of physiology, the science of all vital activity. 

 What we call " normal " in one animal e.g. a bird's mode of ex- 

 cretion is called " diseased " in another ; what is normal at one 



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