Father. S——, how many can you take from one?
S——. None.
Father. None! Think; can you take nothing from one?
S——. None, except that one.
Father. Except! Then you can take one from one?
S——. Yes, that one.
Father. How many then can you take from one?
S——. One.
Father. Very true; but now, can you take two from one?
S——. Yes, if they were figures I could, with a rubber-out. (This child had frequently sums written for him with a black lead pencil, and he used to rub out his figures when they were wrong with Indian rubber, which he had heard called rubber-out.)