The most serious point in the case is the disposition of the child."
What on earth has that to do with it?" I ejaculated.
My dear Watson, you as a medical man are continually gaining insight as to the tendencies of a child by the study of the parents. Don't you see that the converse is equally valid. I have frequently gained my first real insight into the character of parents by studying their children.

Auteur: Arthur Conan Doyle