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Memoir Upon the Formation of a Deaf Variety of the Human Race (1883) / Chapter Skim
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MEMOIR UPON THE FORMATION OF A DEAF VARIETY OF THE HUMAN RACE
Pages 1-3

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From page 1...
... 9 2010 uj THE GEORGE E BROWN, JR LBRARY NATIONAL ACADEMY OF SCIENCES M E M O I R DPON TBE FORMATION OF A DEAF VARIETY OF THE HDMAN RACE.
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From page 2...
... Even though persons afflicted with the same hereditary disease were to intermarry for a number of successive generations, it is doubtful whether any permanent variety of the race could be formed in this way, for the increased tendency to disease mhented by the offspring would probably cause a greater tendency to premature death and ultimately occasion the extinction of the variety. On the other hand, it is reasonable to suppose that the continuous intermarriage of persons possessing congenital defects not associated with diminished vitality or vigor of constitution would result after a number of generations m the production of a vigorous but defective vanety of the race.
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From page 3...
... I f the laws of heredity that are known to hold in the case of animals also apply to man, the intermarriage of congenital deaf-mutes through a number of successive generations should'result in the'formation of a deaf variety of the human race. On the other hand, if it can be shown that congenitally deaf persons marry one another without any greater liability to the production of deaf ofispring than is to be found among the people at large, then it will be evident that we cannot safely apply to man the deductions that have been drawn from experiments upon animals.
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Key Terms

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  • persons possessing
  • successive generations
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  • congenitally deaf

  • possessing congenital
  • probably produce
  • persons marry
  • race susceptible
  • hdman race

  • deaf ofispring
  • persons afflicted
  • congenital defects
  • probably cause
  • ultimately occasion

  • oar breeds
  • coloring matter
  • occasionally found
  • apply selection
  • selective influence

  • consumptives knowingly
  • influence appears
  • hereditary disease
  • permanent variety
  • dpon tbe

  • leptics marrying
  • produce modifications
  • diminished vitality
  • variation produced
  • defective vanety


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