Cucumbers, as food, viii, 365; origin, xiii, 223
Cullen, Dr., refrigerating machine, v, 350, 354-6
Cultivated Plants, birthrate in, xiii, 51; original sources, 221-7, xiv, 381-2 (see also Garden Plants)
Cumulus Clouds, 1, 98, 101-2, 103-4; air currents and, 293; formation of, 93
Cuneiform Writing, xv, 174, 175 (figs.), xvi, 60
Curie, Madame, radium discovery, xvi, 193
Curiosity, instinct of, xi, 55; of crowds, 328
Currents (water) power of, iii, 30-1, xiv, 39, 52-3
Curved Motion, forces producing, iv, 72-3
Custom, Cicero on, x, 135; modesty and, xv, 254-5; morality and, 286; obedience to, how enforced, 374-5; crowd psychology in, xi, 333
Customs Examinations, by X-rays, vii, 256-7
Cutting of Metals, v, 46-7, 54-5, 383; by oxygen jet, i, 33
Cuttings, (plants) propagation by, ix, 337, xiii, 166, 167
Cutting Tools, of ancient Egypt, xvi, 66-7
Cuttlefish, iii, 260, 275-6, xii, 58, 78-9
Cuvier, biological works, xvi, 139, 148; work on paleontology, 168
Cycads, iii, 251, 255, xiii, 309, 316, 317
Cycles, chemical, viii, 334-5, 349-50 (see also Carbon, Hydrogen, nitrogen Cycles)
Cycles, geographical and geological, xiv, 29 (see also Cycles of Erosion)
Cycles, of alternating currents, vi, 153, 154-5; degrees of, 204
Cycles of Erosion, in land surfaces, iii, 33-6, xiv, 30, 34-5, 47-9, 155-64; in mountains, iii, 135-6; in shore lines, 56-7, xiv, 254-5
Cyclones, i, 135-8, 370, xiv, 349-50; electrification by, vii, 212-13; handling of ships in, i, 277-8
Cygni, 61, measurement of distance, ii, 16, 315; parallax, 311-12
Cygnus, nebulæ in, ii, 360; new star in, 332
Cylinders, boring of, v, 44-5; cooling, 159-61, 166-7; in internal combustion engines, 157-61, 166-7; of steam engine, 147; pressure in, iv, 119
Cypress Trees, in landscaping, xiii, 270; in southern forest, xiv, 372
Czecho-Slovakia, public health fellowships, x, 172; stone age remains in, 108 (fig.)
Dairy Products, drain on farm of, viii, 342-3
Daisies, flowers of, xiii, 49-50; introduction to America, 353-4; seed dispersal, 58-9; stems, 23
Daisy Family, xiii, 206; fertilization in, 144; flower forms, 44 (fig.); fossil species, 324; in New Zealand, 380; in pampas, 376; original home and spread, 350, 353; petal arrangement, 190; seed dispersal, 344, 345