| Pike's Peak | Frontispiece |
| | FACING PAGE |
| Sand Dunes in Arizona | 44 |
| Grand Cañon of the Colorado | 45 |
| Castles Carved by Rain and Wind | 52 |
| Where All the Water Comes From | 53 |
| The Richest Gold and Silver Mines | 72 |
| Rocks Being Ground to Flour | 73 |
| A Pond Made by a Glacier | 88 |
| The Struggle Between a Stream and Its Banks | 89 |
| Ripple Marks and Glacial Striæ | 102 |
| Glacial Grooves and Markings | 103 |
| Crinoid and Ammonite | 140 |
| Fossil Corals, Coquina, Hippurite Limestone | 141 |
| Fossil Fish | 152 |
| Meteorite | 153 |
| Eocene Fish and Trilobite | 156 |
| How Coal Was Made | 157 |
| Banded Sandstone. Opalized Wood | 176 |
| Allosaurus | 177 |
| A Three-horned Dinosaur | 178 |
| Remains of Brontosaurus | 179 |
| Restoration of Brontosaurus | 182 |
| Ornitholestes, a Small Dinosaur | 183 |
| A Mammoth | 186 |
| An Ancestor of the Horse | 187 |
| Orion, His Dogs, and the Bull | 214 |
| Other Fanciful Sketches of Constellations | 215 |
| The Sky in Winter | 244 |
| The Sky in Spring | 244 |
| The Sky in Summer | 244 |
| The Sky in Autumn | 244 |
