Perhaps in a week’s time, a month’s time, or even six months later, chancing to recall some phrase in such a letter, and then the whole letter with all its attendant circumstances, he would suddenly grow hot with shame, and be so upset that he fell ill with one of his attacks of “summer cholera.” These attacks of a sort of “summer cholera” were, in some cases, the regular consequence of his nervous agitations and were an interesting peculiarity of his physical constitution.