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 tion of all medical or lay observers, of youths who stood high in their classes, and ranked quite as intellectual prodigies up to or a little beyond the age of puberty, say from fourteen upward—who suddenly, without obvious cause, became stupid as dunces, or losing their vivacity, seemed to fail rapidly in intelligence, and to disappoint the high hopes which had been entertained of them. Ninety-nine per cent of these examples are cases in point.