Even as Tad spoke there was a low muttering of thunder, and the far lightning flashed pale and green, and rose on the long horizon to the southwest.

Kris Kringle heard the far away growl. Springing up, he began staking down the tents.

"That's a good idea. We lost our whole outfit on our last trip. Think they'll stand a blow?"

"I guess they will when I get through with them. Have we any more stakes in camp?"

"There should be some in the kit."

Tad searched until he found several more stakes, and with these and the emergency ropes, they made the tents secure.

By the time they had done so, the heavens had grown black and menacing. They could see the storm sweeping down on them. It was a magnificent sight, and the lads were so lost in observing its grandeur that they forgot to feel any alarm.

A cloud of dust accompanied the advance guard of the storm.

"Reckon there ain't any rain in them clouds," commented the old man. "There's plenty of the other thing, though."

"What's the other thing?" questioned Chunky.