Part 18

Ears, of chicks, 4; of fish, 16, 211-212; of beasts, 28; sixth sense in, 166-167, 189; of ants, 200-202; of other insects, 210; of jelly-fish, 211; of various animals, 211-213; making of, 332; muscles of, 336. Ear minds, 234-235. Egg, of hen, 1-6, 27; of other birds, 7-11, 22, 27, 31, 72-73; of reptiles, 7-8, 10, 12; of fishes, 7, 8, 12, 14-19, 22, 27, 70, 317; of star-fish and sea-urchins, 8-9, 24-27, 69-70, 72, 315, and following; of frogs and toads, 9-11, 27; of beasts, 12-13, 28; living portion of, 43; birds idea of, 97; effect of accidents to, 315 and following, 358 and following. Elephant, teeth of, 323 and following; trunk of, 343 and following. Enzymes, 291 and following. Evolution, 356. Eyes, 32; of chicks, 4, 5; of fishes, 16; how formed, 17-18, 28; images in, 175-176; as camera, 176; and color, 177-179, 183-185; object of two, 185-186; blind spot of, 186-188; of ants, 197-200; of various creatures, 214-215, 219; of insects, 215-217; black, 300 and following; third, 336. Eye minds, 229-233, 237.

Fatigue, cause of, 255 and following. Fighting in play, 88-90. Finger nails, 29, 34, 43, 53. Fish, growth of, 53-54, 61, 70; feeding of, 246; monsters, 317 and following; gills of, 331. Flies and disease, 269-273, 274 and following, 284. Food, as fuel, 244 and following, 252 and following; importance of clean, 275.

Games, best for children, 58-60; why children like, 81-85; of animals, 86-90.

Hair, 80, 43, 58; whitening of, 301 and following. Head, of chick, 4; of fish, 16; early growth of, 293; shapes of human, 355. Horns, 34. Horse, 12; finds its way, 222-224; epidemic among, 284; teeth of, 321 and following; limbs of, 338 and following; feet of ancient, 348 and following. Hunger and thirst, sense of, 172. Hydra, result of injuries to, 307 and following.

Insects, breathing of, 242 and following; and disease, 269. Instincts, 74-98, 101, 109.

Jelly-fish, 40, 46.

Leading shoot, 144-146. Life, length of in various creatures, 61-64; nature of, 239 and following. life-jelly, 25, 27, 46, 238, 249, 251, 303, 356. Light, growth and turning of plants toward, 147-148, 151-152, 156-157; movement of animals toward, 159-164, 196-197. Liver, and sugar, 260; and bile, 278. Lizard, new legs and tails of, 304 and following; third eye of, 337. Lockjaw, 267 and following, 277. Lungs, of chicks, 5, 6, breathing by, 243 and following. Lymph cells, as defence, 280 and following; duties of, 296 and following, 303.

Mammoth, 345. Man, ancient, 351 and following; early migrations of, 354 and following. Milk, importance of clean, 269, 275. Monkey, 12; and box, 101-102; and colds, 285; feet of, 341. Mosquitoes and disease, 269. Mouse, 61-62; and disease, 269; teeth of, 325. Muscles, growth of, 50; working of, 240. Muscle minds, 235-237. Muscular sense, 167-169, 191, 223-225.

Nausea, 173. Nerves, of chick, 4-5; growth of, 50. Nose, and smell, 189-190; of ants, 203-209; bacteria in, 277-278.

Pain, sense of, 170-172. Parents, advantage of two, 65-66; cases of one, 71-73. Parrots, 108-109, 113. Pigs, and rattlesnakes, 264; teeth of, 325 and following. Plants, as engines, 240-241; take food from air, 250, 254; sickness of, 286 and following.

Rabbit, 12, 113, 341. Rat, and maze, 104-105; and disease, 269 and following; teeth of, 325. Reptiles, 63. Roots, growth of, 50, 146-147, 154-155.

Salamander, 333 and following. Sea-anemone, 69, 136-140, 307. Second wind, 259. Seeds, of bean, 20-23; and pollen, 66-69. Shark, teeth of, 327. Sight, illusions of, 177-184. Skin, 32-34, 43, 53, 75; as defence, 276 and following. Snake, poison of, 262 and following; teeth of, 327; lung of, 335; limbs of, 350-351. Soils, diseases of, 288. Speech, 108-118; and brain, 114-118; and thought, 119-120. Speech centre, 120-124. Sponge, 242, 330. Squirrel, teeth of, 325. Star-fish, growth of young, 54-55; food of, 246; re-growth of, 308 and following; monsters, 315 and following. Sugar, as food, 244-245, 251, 253, 291; as poison, 259 and following.

Tadpole, change of to frog, 296 and following. Tails, of human beings, 107-108; of birds, 333. Taste, 190-191, 218. Teeth, of children, 29, 325; growth of, 44-45, 49-50, 299 and following; importance of clean, 277 and following; as tools, 321 and following. Tickling, 89-90. Touch, errors of, 192. Trees, living part of, 42-43; growth of, 48-49, 53-54.

Vaccination, 279 and following. Vine, climbing of, 153-154.

Worms, feeding of, 245; repair of injuries to, 305 and following, 311 and following; monsters, 314.

Yeast, 46, 71, 292.

End of Project Gutenberg's Natural Wonders, by Edwin Tenney Brewster