"‘Sic oculos, sic ille manus, sic ora ferebat'; but scarcely less often the differences which distinguish children both from their parents and from one another. We are told of similar mental peculiarities running in families, and again of a tendency, as in the animals, to revert to a common or original stock. But we have a difficulty in distinguishing what is a true inheritance of genius or other qualities, and what is mere imitation or the result of similar circumstances. Great men and great wo ...