Cæsar, Julius, his literary style compared to that of Mr. Glacier, 254; how he and Mr. Glacier went into winter quarters, 256 Canada, her sea terraces for the gannets, 223 Canada thistles, and the Siberian "wind witches," 178 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 Ceratosaurus, his dreadfulness and his name, 23; and Nature's dream of the coming of man, 23; one of our queer cousins, 264 Civilization, its constant advance, but with ups and downs, 269; the civilization that Mother made, 270 Coal, did it help bring on the Ice Age? 20; bad effect of coal making on plant and animal life--volcanoes to the rescue! 226; coal seams and the records of ancient life, 245 Colorado River, how it dug the Grand Canyon, 88 Conglomerate rock, why it is called "pudding stone," 96; conglomerate boulders as historians, 155; how made in the sea mills, 227 Continents, how they rose out of the sea, 8; how the fact that they are still rising helps the rivers get back to sea, 75; the continents and Nature's accident insurance, 262 Copernicus, and the discovery that there are worlds of worlds, 4 Coral islands and reefs, how the sea helps the corals build them, 225 Coyotes, as ventriloquists, 179; their night songs, 179; how they get a living, 180 Crater Lake, the blue lake in the volcano's mouth, 194, 195 Crevasse, origin of the word, 51; what a crevasse looks like, 51, 53; Agassiz' adventure in, 51; voices of, 54; their water-mills, 55; picture of a crevasse swallowing an avalanche, 63