Page:Popular Science Monthly Volume 80.djvu/493

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That psychical characteristics should play some part in human matings seems a priori highly probable. Actual facts are, however, few. Galton concluded that even good and bad temper made very little difference in marriage selection, but he pointed out many difficulties of obtaining trustworthy evidence.

Elderton found for "Intelligence, Temper, Temperament" and success in career the values given in the accompanying table.

For insanity, working with Pearson's "Family Records" and using two different methods of classifying the "normal," "insane," "nervous" and "doubtful" entries so as to get the upper and lower limits for assortative mating. Miss Elderton finds + .244 as the lower and + .361 as the upper limit, say roughly an intensity of .30 ± .05.