Note 11 — CAUSES OF IDIOCY.

That eminent clinical observer, the late Professor Trousseau, in treating of the influence of consanguine marriages, gives the history of a Neapolitan family, in which an uncle married his niece. There had previously been no hereditary disease in the family; of the four children, the issue of this marriage, the eldest daughter was very eccentric; the second child, a boy, was epileptic; the third child very intelligent; and the fourth was an idiot and epileptic. "Clinique Médicale de l'Hôtel-Dieu de Paris." Tome ii., page 87.