“You never can tell,” said Speckle. “Safety first, as I hear they are teaching the children in school. I’ll just stay on my side of the fence until I see what kind of a boy he is,” and though Blackie kept saying that Arthur was a good boy, and would not plague cats, Speckle would not stay.

Of course Mabel and her brother did not understand what their cat said to the other one, for they did not know animal language, though Blackie and other cats know what boys and girls say to them, or a great deal of it, I think.

“Did you see that strange cat?” asked Mabel of her brother.

“Yes, I guess it belongs to the folks next door,” spoke Arthur. “Now I am going to teach Blackie to stand on her hind legs.”

Arthur picked Blackie up, and rubbed her under the ears. Cats like to be rubbed under the ears, and they will purr if you do it to them. And when a cat purrs it shows it is happy.

Just why cats like to be rubbed, or tickled, under the ears I do not know, any more than I know why a pig likes to be scratched on his back. I only know that this is so. A hoptoad likes to be scratched on his back, also. Many a time I have gone quietly up to a toad in the grass, and, with a little twig, have scratched his back. And Mr. Toad will sit there quietly, and will puff himself out like a little balloon, because he is so pleased to have his back scratched. But you must do it very gently. And poll parrots like to have their heads rubbed. But don’t ask me why, for I don’t know.

Anyhow Arthur rubbed Blackie under her ears, and the black cat liked it and purred in the boy’s arms.

“And now for your trick, Blackie,” said Arthur.

It is not easy to teach a cat to stand on her hind legs, as Arthur very soon found out. Cats do not learn tricks as easily as dogs do, though I have seen performing cats on the stage of a theater. They climbed ladders, walked a tight rope, and did many other little tricks.

Blackie did not know exactly what Arthur wanted her to do. The little boy put the black cat in a corner, so she could lean her back against the sides of the room, and not fall over. Then he lifted her front feet off the floor so that she was resting on her hind ones.