"An old family recipe: 'Eye of newt and toe of frog, 'Wool of bat and tongue of dog, 'Adder's fork and blind-worm's sting, 'Lizard's leg and howlet's wing — '" "Shakespeare!" I said. "Macbeth." "'Cool it with a baboon's blood — ' No, Will got it from me, milord love. That's the way with writers; they'll steal anything, file off the serial numbers, and claim it for their own."