For instance, one-tenth of the deaths that occur in the United States

are from tuberculosis
For instance, one-tenth of the deaths that occur in the United States
are from tuberculosis. But this does not mean that one-tenth of all
families die of the disease. On the contrary, some families lose more
than half their numbers from it, while other families lose almost none
at all. The 10 per cent. is simply the average of all. The percentage is
high among the Irish, and low among the Jews. Life insurance companies
take consideration of this fact in examining applicants for insurance. A
family history of tuberculosis counts against even a healthy applicant,
not because of a belief that tuberculosis is directly inheritable, but
because non-resistant types, especially light-weights, are known to be
transmitted. A profound influence toward checking this malady would
evidently be exerted if the matings on the family lines exhibiting the
characteristic of susceptibility were to cease, and thus the
perpetuation of susceptible types checked.


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