INDEX. 



PAGE 



Abdallah 37 



Abnormal development . . 207 



Abortion 206 



Acacias 35 



Acquired disease transmitted. .44, 207 



Acawoios 201 



Acceleration, law of 39 



Acorns 25 



Acquired characters. 49, 52, 59, 6i, 254 

 Acquired functional capacity... 76 



Acquired sterility 262, 263 



Activity 235 



Acute sexual characters 215 



Adams 100, 109 



Adaptation to circumstances. 263, 267 

 Advantageous variations, 



194, 196, 199, 201 



Afghans 204 



Age at marriage 126, 195. 202 



Ages of males and females, rela- 

 tive 135, 172, 259, 261 



Aggregate use 75 



Aggressive age 164 



Alcibiades 128 



Alexander the Great, 



126, 155, 171, 173, 193 



Alfred the Great 134 



Algeria 204 



Allen 225 



Amazon Indians 200, 201 



Ancient times 116 



Andaman Islands 196,198,202 



Anderson 27 



Angus bull 32 



Animals 217 



Animals in captivity 263 



Ants 231 



335 



PAGE 



Apes 217 



Aphides 231 



Appleton 38 



Arabs 259 



Arabian horse 27 



Archidamus 129 



Aristocracy 192 



Aristotle 50, 51, 90, 127, 161, 172 



Art 261 



Artists, longevity of 239 



Artistic age 164 



Artizans 195 



Ass 31 



Assumptions 74, 257 



Atavism 33 



Athans 126 



Audubon 103 



Augustus 130, 162, 163 



Australians 200, 258 



Average age at reproduction, 



84, 88, 196, 268 



Average birth-ranks no 



Average functional capacity. ... 75 

 Average use 75 



Bach family 179 



Bachelors 195 



Bacon 134, 172 



Ball, Mary 105 



Barbary bitch 31 



Barrington 170 



Basis of investigation 59, 84 



Beard 254, 257, 258 



Beardless races 258 



Beaver 227 



Beecher 93 



Bees 229 



