| 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 |
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