Answer:
In a dark cavern, a bubbling cauldron hisses and spits, and the three witches suddenly appear onstage. They circle the cauldron, chanting spells and adding bizarre ingredients to their stew—“eye of newt and toe of frog, / Wool of bat and tongue of dog” (4.1.14–15). Hecate materializes and compliments the witches on their work.