E-text prepared by Roger Frank
and the Project Gutenberg Online Distributed Proofreading Team
(http://www.fadedpage.net)

Spitfire began to double in his best bucking form. —Page 15

TO
H. F. B.,

INTRODUCTION

A pack-burro camping trip in an unexplored region of the high Sierras resultsin a series of adventures for three boys in the late teens, a young GeologicalSurvey man and the old prospector who guides them.

They meet bears and catch rainbow trout, are carried to fight fire by theForest Service Air Patrol, and trail the incendiaries through a labyrinthianlimestone cave. They ride in a lumber camp rodeo and experience earthquakes andavalanches. And in the glacier-gouged canyons, the giant Sequoias, and sulphursprings, they trace the story of the geological formation of the earth, and itsevolution from the days of dinosaurs.

CONTENTS