INDEX. 



341 



Inheritance of acquired varia- 

 tions, 270, 273 



Insectivora, 181 



Instinct and moral sense, 320, 

 327 



Intelligence, 294, 296, 299 



Internal, factors in evolution, 252 ; 

 laws of variation, 29, 252 



Islands once connected with 

 mainland, 198 



Isolation, effect of, 190, 247 



Isthmus of Panama, 183, 184 



J 



Sager's theory of heredity, 276 

 ay, 179, 180 



Knowledge of tools, fire, etc., 305 

 L 



Lamarck, n, 262 

 Language, 306 

 Larval life, effect of, 145 

 Laws of distribution, 168 

 Life in Silurian, 94 

 Limits of variation, 31 

 Lingula, 106 



M 



Magpie, 180 



Mammals on islands, 193 

 Man as a fossil, 292 

 Man the highest animal, 331 

 Man's influence on distribution, 

 Man's physical nature, 290 

 Marsh-tit, 179 

 Marsupials, 172, 178, 252 

 Meehan, 250 



Migration theory of Wagner, 247 

 Mimicry, 235 

 Minute steps, 226 

 Missing link, 65 

 Mivart, 255, 320 

 Mole, 180 



Monkeys, New and Old World, 

 171, 177, 178 



Moral, nature, 314 ; sense, 317, 

 320 ; sense in animals, 318 ; 

 sense as explained by Darwin, 

 320 



Mutability of species, 22 



Nageli, inherent tendency to 

 vary theory, 253 



Narrow straits as barriers, 199 



Nascent organs, 82 



Natural selection, 208 ; origi- 

 nates nothing, 213 ; still ac- 

 cepted as sufficient by some, 

 246 



Negro, 310 



Neo-Lamarckianism, 29, 262 



Notochord, 133 



Number of types, 60 



O 



Oceanic islands, 189 

 Odontornithes, no 

 Ontogenetic descent, 78 

 Origin of variations, 251 

 Ovum, division of, 272 



Paleobotany, 115 



Pangenesis, theory of, 276 



Parallel between embryology and 

 paleontology, 123 



Peacock, 258 



Pigeon, 24, 26, 34, 46, 48, 191, 

 247 



Planorbis, 46 



Potto, 230 



Power to improve, 309 



Presilurian times, 96 



Prevalence of the evolution the- 

 ory, 1 8 



Primates, 292, 296 



Proboscidea, 66 



Prophetic organs, 82 



Protista, 67 



Pug-dog, 26 



