Hydrogen, and the making of earth's air, [16]
Ice Ages, theories as to their origin, [20];
the three union stations of the ice trains, [27];
how the glaciers put the Missouri River together, [29];
how they pushed the Mississippi about, [30];
how they turned rivers around and made waterfalls for New England, [31];
how they chiselled out stone bowls for the Great Lakes, [34];
how they made other lakes, [194];
the thousand-year clock at Niagara Falls and what it tells about the Ice Age, [35];
how the glaciers set Niagara Falls up in business, [36];
Muir's eloquent tribute to the marvellous "busy work" of the snowflakes, [37];
how the Ice Age glaciers went off and left the butterflies and the flowers in the Alps, [47];
how the butterflies missed the train, [48];
how Agassiz discovered the Ice Age, [52];
how the glaciers moved the hills about, [117];
travels of the boulders and how the glaciers rounded them, [146], [155];
why there are no big caves in glaciated regions, [148];
relation of the Ice Ages to the Dead Sea and the Sea of Galilee, [206];
Burroughs's theory as to future Ice Ages, [219];
what rain-drop autographs tell of the Ice Age, [246];
a perched boulder and its autograph in a New York City park, [250];
records of the Ice Age glaciers compared with Cæsar's Commentaries—curious similarities, [252]
Icebergs, how to make them in the schoolroom, [32];
how the icebergs of the Ice Age gave the boulders a ride, [153]
Ice wells, huge ice water tanks that the Ice Age glaciers left, [49]
Indian Ocean, why its waves rise to salute the Himalayas, [140]
Islands, oceanic, the tops of volcanoes, [133];
islands on the Maine coast and how they were made, [212];
how the sea helps the corals build their islands, [225]
"Joints," places where rocks don't join, how made, [33];
how they help make "perched rocks," [60];
joints in the "Marble Rocks" at Jabalpur, [105];
joints and the work of the sea's rock mills, [216];
use of joints in Nature's stone architecture, [228]
Jordan River, why it was born partly grown, [73]:
why the making of the Jordan Valley was the death of the Dead Sea, [206]
Jungfrau, summer pastures on, [41];
its beauty, [44]
Jupiter, how as rain god he put out the world, [3];
place of the planet in the Solar system, [6]
Keewatin, one of the central stations of the Ice Age, [28]