[IV.]
A SUBTERRANEAN MUTINY.
It seemed rather strange that it should have been left there, and yet Jimmieboy was glad that in grading his papa's tennis-court the men had left that bit of flat rock to show up on the surface of the lawn. It had afforded him no end of pleasure since he had first discovered it. As a make-believe island in a raging sea of grass, he had often used it to be cast away upon, but chiefly had he employed it as a vantage ground from which to watch his father and his father's friends at their games of tennis. The rock was just about large enough for the boy to sit upon and pretend that he was umpire, or, as his father said, mascot for his father's opponents, and it rarely happened that a game of tennis was played upon the court that was not witnessed by Jimmieboy seated upon his rocky coigne.
The strangest experience that Jimmieboy ever had with this bit of stone, however, was one warm afternoon last summer. It was at the drowsy period of the day. The tennis players were indulging in a game, which, to the little onlooker, was unusually dull, and he was on the point of starting off in pursuit of something, it mattered not what, so long as it was interesting enough to keep him awake, when he observed a most peculiar thing about the flat stone. It had unquestionably become transparent! Jimmieboy could see through it, and what he saw was of most unexpected quality.
"Dear me!" he ejaculated, "how very queer. This rock is made of glass."
Then he peered down through it, and saw a beautiful marble staircase running down into the earth, at the foot of which was a great door that looked as though it was made of silver, and the key was of gold. At the sides of the staircase, hanging upon the walls, were pictures of strange little men and women, but unlike the men and women in other pictures, they moved about, and talked, and romped, and seemed to enjoy themselves hugely. Great pictures were they indeed to Jimmieboy's mind, because they were constantly changing, like the designs in his kaleidoscope.
"I must get down there," he said, softly, to himself. "But how?"