CONTENTS

I[Mummy Cañon]
II[Something About Dr. Byrd]
III[A Fall from the Air]
IV[The Wreck and the Aviator]
V[Lost!]
VI[The Scream in the Waterfall]
VII[A Badly Frightened Boy]
VIII[Hal’s Discovery]
IX[Hal a Prisoner]
X[The Mystery of the Leather Bag]
XI[Convincing Bad]
XII[Airship Plans]
XIII[The “Painter”]
XIV[Building the Airship]
XV[Stolen Wealth]
XVI[Flight]
XVII[Exploring the Cave]
XVIII[The Island in the Air]
XIX[The Rescuing Airship]
XX[The Panther and the Cave]
XXI[To Flathead by Airship Again]
XXII[Clearing Hal]
XXIII[The Boy Scouts of the Air]
XXIV[Mountain Lion Bridge]

CHAPTER I
MUMMY CAÑON

“Mountain, pine tree, cañon, gulch,

Cookies, bacon!—like ’em much.

Canteen, hike-stick!

Hi-hi-hike-stick!

Lakefarm! mummy!