Acquired characters, heredity of, 39, 103, 133.
Adaptation, 7, 13, 55, 62, 67, 71, 159, 165; of species and of specific characters, 166.
_All-sufficiency of Natural Selection_, referred to, 65, 95.
_Alone with the Hairy Ainu_, referred to, 26.
American and European trees compared, 201.
_American Journal of Science_, referred to, 273.
_American Naturalist_, referred to, 35, 58.
_Animal Life and Intelligence_, referred to, 33, 36.
_Apparent Paradox in Mental Evolution_, referred to, 90.
Appendages of Normandy and Irish pigs, 188.
BALL, Mr. Platt, referred to, 3, 95; quoted, 50.
Birds, diagnostic characters of, 176; of Australia, effect of climate on, 210; influence of food on, 218.
BROCA, Prof., referred to, 64, 67, 174, 318.
BROWN-SÉQUARD, referred to, 104, 122, 142; quoted, 104.
Butterfly, seasonal changes of, 210; influence of food on, 217.
_Cave Fauna of North America_, quoted, 211.
Cessation of Selection, 99, 199, 212, 292.
Characters, adaptive and specific, 159, 307; specific, due to Natural Selection, 171.
_Charadriidae, Geographical Distribution of the Family_, quoted, 173.
Climate, influence of, on plants, 200; on animals, 209.
Colour-changes in butterflies, 210. in cave animals, 211.
Congenital, as opposed to acquired characters, 134.
Constancy of characters not necessarily due to Natural Selection, 186.
_Contemporary Review_, referred to, 60, 65, 95
Continuity of germ-plasm, 44, 61, 133; absolute and relative, 134, 155.
_Contributions to the Theory of Natural Selection_, referred to, 2; quoted, 180.
COPE, Prof., referred to, 14, 15, 20, 63, 256; quoted, 16.
CUNNINGHAM, Mr. J. T., quoted, 103; referred to, 95, 122.
DARWIN, Charles, referred to, 1-13, 20-22, 25, 44, 45, 51-53, 56, 66, 67, 74, 87, 88, 93, 95, 96-100, 149, 159, 160, 167, 173, 174, 181-183, 187-191, 193, 195, 198, 200-202, 213-216, 218, 219, 226, 256, 261-265, 268, 271, 277, 283, 287, 291, 305-307, 313-332, 337; quoted, 11, 53, 66, 96, 181, 182, 186-191, 193, 195, 201, 202, 213-215, 261, 262, 265, 313-316, 319-322, 324-326, 328-331, 337.
_Darwin et ses Précurseurs Français_, referred to, 234.
_Darwinian Theory of the Origin of Species_, quoted, 254.
_Darwinism_, quoted, 22, 27, 67, 181, 182, 186, 189-191, 221, 222, 235, 236, 252, 253, 269, 270, 273, 313, 316; referred to, 7, 12, 15, 20, 70.