top which had been wrenched apart by the violence of the wind.

"It's g-g-g-gone d-d-d-own the bab-b-b-back of my n-n-n-neck," sputtered Ding-dong Bell protestingly.

"Never mind, Ding-dong," comforted Joe, "maybe it will wash your parts of speech out straight."

"I'm going to head for that cave yonder," exclaimed Nat, after running a few more minutes.

He had spied a dark opening in the rocks to his right, while the others had been talking, and had guessed that it was the mouth of a cave of some sort. And so it proved.

The auto was turned off the road, or rather track, and after bumping over rocks and brush rolled into the shelter of the cavern. It seemed quite an abrupt change from the warring of the elements outside to the darkness and quiet of the chamber in the rocks, and the Motor Rangers lost no time in lowering the hood and looking about to find out in what sort of a place they had landed.

So far as they could see, after they had all climbed out of the car, the cave was a large one. It ran back and its limits were lost in darkness. The mouth, however, was quite a big opening, being more than twenty feet across at the base. It narrowed into a sharp-topped arch at the summit, from which greenery hung down.

"Let's see where we are," remarked Nat, taking off his heavy driving gloves and throwing them upon the driver's seat.

"You'd have to be a cat to do that," laughed Joe Hartley, gazing back into the dense blackness of the cavern.

"That's soon fixed," added Nat, and removing one of the lights of the car from its socket he pressed a little button. A sharp click resulted, and a flood of brilliant white radiance poured from the lamp. It was an improved carbide contrivance, the illuminant which made the gas being carried in its socket.

The boy turned its rays backward into the cave, flooding the rough, rocky walls, stained here and there with patches of dampness and moss, with a blaze of light.

"Say," cried Joe suddenly, as the rays fell far back into the cave but still did not seem to reach its terminus, "what is that back there?"

As he spoke he seized Nat's sleeve in a nervous, alarmed way.

"What?" demanded Nat, holding the light high above his head in his effort to pierce the uttermost shadows.

"Why that—don't you see it?" cried Joe.

"I do now," exclaimed Nat in a startled voice, "it's——"

"T-t-t-two g-g-glaring eyes!" fizzed Ding-dong Bell.

As he spoke, from behind the boys, came a low, menacing growl. They faced about abruptly to see what this new source of alarm might be.

As they all turned in the direction from which the growl had proceeded—namely the mouth of the cave—a cry of dismay was forced from the lips of the three lads. Stealthily approaching them, with cat-like caution, was a low, long-bodied animal of a tawny color. Its black-tipped tail was lashing the ground angrily, and its two immense eyes were glaring with a green light, in the gloom of the cave.

"A mountain lion!" cried Nat, recognizing their treacherous foe in an instant.

"And its mate's back there in the cave," called Joe, still more alarmedly.

"G-g-g-g-get the g-g-g-guns!" sputtered Ding-dong.

This was far more easy to recommend than to accomplish, however. The lads, never dreaming that they would want their weapons, had left them in the automobile. The car, as will be recalled, had been left near the mouth of the cave. The mountain lion advancing toward them had already passed the auto and was now between them and the place in which their weapons were reposing.

The mountain lion, or cougar, ordinarily not dangerous unless it gets its foe at an absolute disadvantage, becomes, during the mating season, a vindictive, savage brute, if separated from its mate. That this was now the case was evident. There was no room to doubt that the two green eyes glaring from the remote blackness of the cave were the optics of another "lion."

The young Motor Rangers were fairly trapped. Without weapons or any means of protecting themselves but their bare hands, they were in imminent peril of a nasty conclusion to their sudden encounter.

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 claws that would have torn him badly had they struck.

But Ding-dong, though deliberate in his speech, was quick in action. He leaped backward like an acrobat, as he saw the mighty muscles tauten for action, and so escaped being felled by the blow. He could feel it "swish" past his nose, however, and entirely too close to be pleasant.

In the meantime, Nat, realizing that his best move would be to get to their arms, had made a flying leap for the auto and seized an automatic rifle of heavy calibre. As Ding-dong leaped back he aimed and fired, but in the darkness he missed, and with a mighty bound the wounded cougar leaped out of the cave and dashed off through the storm into the brush on the hillside above.

"One!" exclaimed Nat, like Monte Cristo in the play.

The others gave a low laugh. They could afford not to worry so much now. True, there was one of the cougars still back in the cave, but with their rifles in their hands the lads had little to fear.

"I felt for a minute, though, like I did that