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. 



9. Immunity. 



10. Note on Chromosomes in Man. 

 n. 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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