Part 19

Hippotherium, 166, 167

Hoactzin, habits of, 74, 75*

Horn does not petrify, 130

Horse, abundant in Pleistocene time, 164 books on, 176 of bronze age, 163, 167 collections of fossil, 176 development of, 167, 168,* 175 differences between fossil and living, 163 early domestication, 165 evidence as to genealogy, 170-173 extra-toed, 172, 173 found in South America in 1530, 165 of Julius Caesar, 172 none found wild in historic times, 165 Pliocene, 166 possibility of existence in America up to the time of its discovery, 169, 170 primitive, 160, 161*

Horse, sketched by primitive man, 163 teeth of, 170 three-toed, 166

Humming-bird, exterminated by hurricane, 231

Hydrarchus, 62*

Hyracotherium, 160, 161,* 170, 174

Ichthyosaurs, silhouettes of, 132

Iguanodons, found at Bernissart, 104

Impressions of feathers, 131 of scales, 131 of skin, 131

Inbreeding, effects of, 231, 232

Information, sources of, xvi

Innuits, habits, 192

Interdependence of animals and plants, 234, 235, 238

Ivory, fossil, 2, 4, 188, 189

Jaw of Mosasaur, 54* of reptiles, 53

Killing of the Mammoth, story, 177, 193

Kimmswick, deposit of Mastodon bones, 209

Knight, Charles R., restorations by, xviii, 136

Koch's Hydrarchus, 61, 62* Missourium, 207,* 208

Leaves, impressions of, 3, 13

Leg of Brontornis, 149*

Leg of the Great Brontosaurus, 96* of Giant Moa, 152* position in Hesperornis, 83 position in ducks, 84

Lenape Stone, 215, 216, 219*

Life, earliest traces of, 21, 34

Lingula, antiquity of, 228 Professor Brooks on, 229

Loricaria, 24*