When he had found that it was the effect of the different levels, his attention was arrested by a multitude of moving objects in a still more distant field, which proved to be a band of wild horses.

In and out among them, circling aimlessly, as it seemed to him, appeared two horsemen apparently performing some mystic evolution.

To add to their singular performance, from time to time one of the flying herd, driven by the horsemen far beyond the circle of its companions, dropped suddenly and unaccountably in full career.

The field closed over it as if it had been swallowed up.

In a few moments it appeared again, trotting peacefully behind its former pursuer.