[Illustration: Straight and true it sped to its mark. The lion had already crouched for a spring when Nat's missile was discharged. CHAPTER PAGE I. INTO THE SIERRAS 5 II. BETWEEN TWO FIRES 17 III. IN A RUNAWAY AUTO 31 IV. MOTOR RANGERS TO THE RESCUE 43 V. AN APPOINTMENT ON THE TRAIL 55 VI. SOME RASCALS GET A SCARE 66 VII. A PHOTOGRAPHER IN TROUBLE 77 VIII. LOST IN A PETRIFIED FOREST 87 IX. THE MIDNIGHT ALARM 99 X. ALONG THE TRAIL 110 XI.…
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