The fourth book in the Land of Oz series by L. Frank Baum and John R. Neill is titled Dorothy and the Wizard in Oz. When a strong earthquake occurs, Dorothy, Eureka (her cat), and Zeb are traveling in a buggy driven by Jim, a taxi horse. They descend far into the Earth when a rift in the earth opens under them. When a strong earthquake occurs, Dorothy, Eureka (her cat), and Zeb are traveling in a buggy driven by Jim, a taxi horse. They descend far into the Earth when a rift in the earth opens under them. The Wizard ""conjures"" nine small, mouse-sized pigs in order to compete against the Mangaboo Sorcerer and show off his (humbug) magic abilities. When Eureka requests the Wizard for permission to eat one of the piglets, he responds furiously. The Wizard reacts to the Sorcerer's threat by slicing him in half, exposing his true vegetable nature. Eventually, the visitors are forced out of their nation and into a shadowy tunnel that leads to another realm. When Dorothy provides a certain hand signal, Ozma can see what she is doing with the help of her magic image and use her magic belt to take her out of harm's way. The highlights of the others' prolonged stay include a race between Jim and the wooden Saw-Horse.