The Great Sorceress Betsy and Trot, when they heard of the rescue expedition, begged the Wizard to permit them to join it and he consented.

The Glass Cat, overhearing the conversation, wanted to go also and to this the Wizard made no objection.
This Glass Cat was one of the real curiosities of Oz.

It had been made and brought to life by a clever magician named Dr.Pipt, who was not now permitted to work magic and was an ordinary citizen of the Emerald City.

The cat was of transparent glass, through which one could plainly see its ruby heart beating and its pink brains whirling around in the top of the head.
The Glass Cat's eyes were emeralds; its fluffy tail was of spun glass and very beautiful.

The ruby heart, while pretty to look at, was hard and cold and the Glass Cat's disposition was not pleasant at all times.
It scorned to catch mice, did not eat, and was extremely lazy.