NOT TO BE CAUGHT.
Mathematical Master (after carefully explaining new rule). "Well, Tertius, and what is four per cent. on £5?"
Tertius. "Ten shillings."
Mathematical Master. "No, no."
Tertius. "Five shillings."
Mathematical Master. "No!"
Tertius. "Half-a-crown."
Mathematical Master. "Now, Tertius, it's no use guessing; just think. I'll give you half-a-minute to pull yourself together." (After interval of half-a-minute) "Well?"
Tertius (with confidence). "Please, Sir, there isn't one."