INDEX 



Aberystwith, ioi 



Abietineae, polyembryony in, 179 



Ability, and brain, 234 



inheritance of, 145, 147, 148, 

 170, 222 

 Abnormal segmentation of fingers, 



Abnormalities, inheritance of, 75, 

 76, 106, 116, 125, 127, 129, 

 142, 158, 174 

 occurrence of, 93, 204 

 Abortions in primitive races, 241 

 Absence of external ear, 133, 



134 

 of patella, 136 



Acanthosicyos horrida, 227 

 Achondroplasia, 34, 35, 39, 40, 



126, 215 

 Acromegaly, 211, 216 

 Addison's disease, 212 

 Adkinson, June, 138 

 Adrenal capsules. See Supra- 

 renal capsules 

 Adrenalin, 217, 218, 220 

 Agriculture, 241, 242 

 Ailments of twins, 188 

 Aino of Japan, 54 

 Albert, Henry, 93 

 Albinoes, eyeballs of, 44 

 Albinism, change in hereditary 

 behaviour of, 70 



frequency of, 65 



in animals, 68 



in cattle, 69 



in guinea-pigs, 125 



inheritance of, 57, 6y, no 



in horses, 71 



in rabbits, 125 

 Albinotics, 58, 65, 68 

 Alcohol, effect on germ cells, 92 

 Alcoholism, 142, 149, 153, 235 

 Alexander, 103 

 Alkaptonuria, no 

 Allelomorphs, multiple, 27 



Alpine race, 212, 231 

 Amaurosis, 117, 120, 142, 158 

 Amblystoma, 41 

 American army intelligence tests, 



234 

 Americans in crosses, 230 

 Amerindians, 10 1 

 Amphibians, hermaphrodites in, 



133 

 Amphioxus, 210 



Analysis of the mind, 146 



Ancestral inheritance in man, 209 



Ancon sheep, 40 



Anencephali, 193 



Angioneurotic oedema, 127 



Angora hair, in guinea-pigs, 1 5 



in other animals, 125 



Animal behaviour, 165 



Aniridia, 116, 120, 130 



Anodont condition, 71 



Anthropoid apes, behaviour of, 



165 



hormones in, 217 



Antibody, 144 



Antisocial behaviour, 163 



Apache Indians, left-handedness 



in, 72 



Apes, placenta of, 1 78 



Apogamy, 209 



Apprenticeships, 244 



Arable land in the United States, 



245 

 Arabs, Polydactyly in, loi 



Arboreal ancestry of man, 17S 



Arctomys, 68 



Arey, L. B., 199 



Argentine, crosses in, 230 



Aristocratic society, 221 



Aristotle, 98 



Arizona, 39, 65 



Armadillo, scutes of, 181, 19^ 

 I young of, 176, 177, 17S, iSi, 



182, 199, 200 



Arrested development, 89, i 54 



Arsenic, in thyroxin, 214 

 1 Artificial selection, 175 



273 t8 



