CHAPTER II.
BETWEEN TWO FIRES.

Snarling in very much the manner of an angry cat, the lion, which had appeared at the mouth of the cave, began to come forward more rapidly. At the same instant, as if by mutual consent, his mate started to advance from the rear of the cave. It was evident that if they did not wish to be seriously injured, perhaps killed, the Motor Rangers would have to act, and act quickly.

But what were they to do? Nat it was who solved the question. The floor of the cave was littered with boulders of various sizes, ranging from stones of a pound or so in weight, up to huge rocks beyond a boy's power to lift.

Stooping down swiftly Nat selected a stone a little larger than a baseball, and then throwing himself into a pitching posture, awaited the oncoming cougar, approaching from the cave mouth.

The boy had been the best pitcher the Santa Barbara Academy had ever produced, and his companions saw in a flash that he meant to exercise his skill now in a way of which he had little dreamed when on the diamond. His hand described an evolution in the air, far too quick to be followed by the eye. The next instant the stone left his grasp, and swished through the atmosphere.

Straight and true it sped to its mark.

And it struck home none too quick. The lion had already crouched for a spring on the defenseless lads, who stood between himself and his mate, when Nat's missile was discharged.

Crack!

The sharp noise of the stone's impact with the skull of the crouching feline sounded like a rifle shot.

"Bull's-eye!" yelled Joe excitedly.

And bull's-eye it was. The rock had a sharp edge which Nat, in his haste, had not noticed. As it struck the lion's head it did so with the keen surface foremost. Like a knife it drove its way into the skull and the lion, with a howl of pain and fury, turned, stumbled forward a few paces, and then rolled over.

Before the others could stop him, Ding-dong Bell, entirely forgetting the other lion, dashed forward to examine the fallen monster. The result of his action was that his career came very near being terminated then and there. The cougar had only been stunned, and as the stuttering boy gave one of its ears a tug, it leaped erect once more and struck a blow at him with its chisel-like