Double, double toil and trouble; Fire burn, and caldron bubble. Fillet of a fenny snake, in the caldron boil and bake; 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 owlet's wing! --The Three Witches, Macbeth, by William Shakespeare










