The tribe had been almost
wiped out, Dr. Farabee reported, by an epidemic of _influenza_!
If the aborigines of the New World succumb to the diseases of the
European, it is not less true that the European succumbs to diseases
against which his race has not been selected. The deadliness of yellow
fever to Americans in the tropics, and the relative immunity of Negroes,
is familiar; so too is the frequently fatal result of the African
tropical fevers on the white man, while the natives suffer from them
much less, having been made more resistant by centuries of natural
selection.
This long discussion may now be summarized. We dealt with lethal
selection, that form of natural selection which operates by prematurely
killing off the less fit and leaving the more fit to survive and
reproduce their kind. It is of course understood that the word "fit" in
this connection does not necessarily mean morally or mentally superior,
but merely fit for the particular environment. In a community of
rascals, the greatest rascal might be the fittest to survive. In the
slums of a modern city the Jewish type, stringently selected through
centuries of ghetto life, is particularly fit to survive, although it
may not be the physical ideal of an anthropologist.
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