INDEX 249 
Horse, sketched by primitive man, 163 
teeth of, 170 
three-toed, 166 
Humming-bird, exterminated by hurricane, 231 
Hydrarchus, 62* 
Hyracotherium, 160, 161,* 170, 1'74 
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* 
