| A Wild Garden in the Wonderland, on the Eastern Boundary-Line of the Rocky Mountain National Park | Frontispiece |
| The Narrows, Long's Peak Trail | 14 |
| A Wild Mountain Sheep | 40 |
| The Way of the Wind at Timber-Line | 52 |
| A Timber-Line Lake in Northwestern Colorado | 64 |
Lizard Head Peak in the San Juan Mountains
Photograph by George L. Beam. | 84 |
|
Alpine Pastures above Timber-Line, near Specimen Mountain in the Rocky Mountain National Park
Photograph by John K. Sherman. | 104 |
At the Edge of the Arctic-Alpine Life Zone in the San Juan Mountains
Photograph by George L. Beam. | 116 |
| A Western Yellow Pine | 126 |
| Crystal Lake; a Typical Glacier Lake | 150 |
| Trapper's Lake | 158 |
| Cricket, the Return Horse, at the Summit of the Pass | 172 |
| Looking Eastward from Lizard Head | 180 |
Overgrown Cones in the Heart of a Lodge-Pole Pine
Photograph by Herbert W. Gleason. | 222 |
| A Mountain Park in the San Juan Mountains | 230 |
Capitol Peak and Snow Mass Mountain from Galena Park, Colorado
Photograph by L. C. McClure, Denver. | 242 |
| A Deer in Deep Snow, Rocky Mountain National Park | 260 |
Entertaining a Chipmunk Caller
Photograph by Frank C. Ervin. | 278 |
Pike's Peak from the Top of Cascade CaÑon
Photograph by Photo-Craft Shop, Colorado Springs. | 296 |
| The Continental Divide near Estes Park | 314 |
Long's Peak from Loch Vale
Photograph by George C. Barnard. | 322 |
| Map of the Rocky Mountain National Park | 336 |
Estes Park Entrance to the Rocky Mountain National Park
Photograph by Mrs. M. K. Sherman. | 340 |
The Fall River Road across the Continental Divide in the Rocky Mountain National Park
Photograph by W. T. Parke. | 344 |
