But still, far and near, nothing but snow was to be seen.

Then suddenly, ahead of them, a shadow showed, a shambling shadow! Tumbu stopped dead, sniffed, then with a bound was off full tilt after it, the sledge, with the two children in it, flying behind him! For an instant the others were too much astonished to speak.

Then Roy, with frantic cries to Tumbu to come back, was off after them.

In vain! As he crested a little rise he saw by the growing light a big brown Isabelline bear shambling along contentedly, seeming to go no pace at all, yet gaining steadily on the sledge that was giving chase.
"I will follow as fast as I can!" panted the Rajput lad breathlessly, as Foster-father, Meroo, and Old Faithful, hampered by their greater weight, ran up.

"It is a bear; but they cannot catch it--and Tumbu will tire--then he always comes back.