As everyone knows "tar" means white in the language of the great apes, and "go" means black, so Doc, with his light hair, was known as Tarzan-tar and Dick, whose hair was black, was called Tarzan-go. It was all right to be called Tarzan-tar and Tarzan-go, until the other boys began to make fun of them because they could climb trees no better than many another boy and, while they were fair in athletic sports, they did not excel. It was right there and then that Dick and Doc decided that they would live up to their new names, for they did not enjoy being laughed at and made fun of, any more than any other normal, red-blooded boy does.