Canyons, deepened by glaciers, [26], [37];
how pebbles helped make the Grand Canyon, [82];
how long a mile is—straight down! 87;
how the Grand Canyon swallows you up, [88];
how rivers wrote the history of the Grand Canyon and how they cut the leaves, [88]
Caravan, the marching camels and their shadows, [185]
Carbonic acid gas, and air making, [16];
how it helped make coal with one hand and the Ice Age with the other, [20];
how it helps the volcanoes feed the world, [128]
Carpathian Mountains, why they do not border the sea, [138];
their ups and downs under the sea, [230]
Castle Head, a remarkable example of Nature's masonry, [228]
Catskill Mountains, how they were made, [116]
Cavemen, a caveman's art note on mammoths, [22];
why they were the handsomest men of their day, [267];
the joyous lesson they helped teach, [269]
Caves, relation to natural bridges, [85];
why large ones are never found in boulder regions, [148];
their sightless inhabitants, [186]
Centipede, his numerous feet and objectionable character 62;
how the trap door spider slams the door in his face, [182]
Centrifugal force, and the birth of worlds, [4];
and the direction of mountain ranges, [137]