45° 



ANALYTICAL INDEX 



2-4 ; sexual instinct and, 65 ; renders 

 organisms susceptible to stimulus, 

 73 ; response to stimulus and, 74 

 n. 2 ; Huxley's doubts upon, 77-80 ; 

 not the cause of interspecific sterility, 

 So, 89, 91 ; cessation of, a cause of 

 interspecific sterility, 80-2 ; fertility 

 and, 80-2 ; aided by syngamy, 93-4 ; 

 the Darwin- Wallace joint essay upon 

 (1858), 95-7, 194-6: see also xxxvii 

 n. 2, 48, 58, 200, 222, 379 ; does not 

 explain variation, 96-7 ; Lamarck's 

 theory compared with, 101 ; 

 Lamarck's theory confused with, 

 101-3, 104 ; Duke of Argyll's ex- 

 planation of belief in, 101-2 ; diffi- 

 culty with which apprehended, 101- 

 4 ; parodies on, 102-4 ; utility and, 

 105-9 ; Natural elimination or, 105 ; 

 advantages of name, 105 ; objections 

 to, 105-10; brain evolution and, 107- 

 8 ; Palaeontology and, 107-8 ; origin 

 of organs and, 108-9 ; a true cause of 

 evolution, 109, no; mutation and, 

 no; form of joints and, 112, 113; 

 Crustacean claws and lizards' tails, 

 113, 114; forms of joints and teeth 

 and, 115 ; instincts and, 1 16-19, l 3%> 

 154-66 ; cryptic adaptation and, 

 154-7; the cocoon-making instinct 

 and, 117, 118, 157-60, 164 ; instincts 

 of Fossores and, 118, 119, 160-4; 

 use-inheritance and, 137, 138 ; varia- 

 tion and, 137 ; effect of cessation of, 

 137, 138 ; nervous system and, 138; 

 variable protective resemblance and, 

 152-4; struggle in young birds 

 and, 167, 167 n. 2, 168 ; limited but 

 undoubted use of by J. C. Prichard 

 (1826), 174, 191 ; Huxley and, 193- 

 219 ; history of discovery of, 193, 

 194 ; Huxley's ignorance of, July, 

 1858-Nov. 1859, 195, 196; Huxley's 

 opinion of, 201, 202 ; basis of belief 

 in, 202 ; confirmed by observation of 

 Nature, 202 ; dead-leaf-like butterflies 

 and, 203-6; adaptation in Lepidoptera 

 and, 203-18 ; seasonal changes in 

 butterflies and, 206-11 ; confirmation 

 of, 218-19 ; prediction and confirma- 

 tion as test of, 2 1 9 ; H uxley's defence of, 

 219; evidence of advantage conferred 

 by concealment, 288, 289 ; Hypertely 

 used as an argument against, 302, 

 303 ; proof of severe struggle in pupal 

 stage of V. wticae, 306 ; darkening 

 of N. moths and, 308-10; seasonal 



changes and, 206-11, 310, 311, 320, 

 339-42 ; species rather than indivi- 

 dual benefited by, 316; individual 

 subordinated to species by, 358. 



— Mimicry and: — Essays VIII 

 and IX, 220-82: see also 21 1-1 8; the 

 origin of a mimetic likeness and, 

 218; increasing confidence in, as an 

 explanation of mimicry, 224 ; con- 

 sistent with facts of mimicry, 225 ; 

 relation of, to Protective Resemblance 

 and mimicry the same, 227, 237-42, 

 259 ; criticism of, founded on study of 

 limited examples of mimicry, 229 ; 

 the interpretation of mimicry when 

 other theories fail, 227-9, 232-3, 235- 

 42, 245, 246, 248, 250, 258-62, 266-8, 

 270, 273, 275, 276, 278-82 ; the in- 

 terpretation of the fewness of colours 

 in specially protected groups, 234, 277- 

 8 ; the female sex and, 215-17, 244-7, 

 2 79> 353> 372—S ; favourable conditions 

 for operation of, in S. America, 248 ; 

 production of mimicry in covering 

 shield rather than insect beneath 

 by, 258, 258 (Fig. 6), 259, 280, 369; 

 mimicry by Membracid of ant and 

 leaf carried by it, 259, 259 (Fig. 7), 260, 

 280, 377 ; the cause of mimicry, 267- 

 70 ; belief in because of consistency 

 with facts, 268, 271 ; evidence of ad- 

 vantage conferred by mimicry, 288 ; 

 Bates's theory of mimicry one first 

 great result of, 361. 



Naturalist in Nicaragua, T. 

 Belt, 240. 



Naturalist on the Amazons, 

 H. W. Bates, 51, 51 n. 1. 



Naturalist upon the Age of 

 the Earth, Essay I, 1-45. 



Naturalist, Natural Selection and 

 the experience of the, 202. 



Nature, xxii, xxxix, xl n. 2, xlvii, 

 8, 11, 13, 15, 19, 56 n. 2, 62 n. 1, 

 92, 140, 141 n. 2, 142 n. 5, 143 n. 1, 

 n. 3, 144 n. 2, 146, 152, 153, 154, 

 161, 163 n. 3, 164 n. 1, n. 3, 165, 166, 

 167, 232, 293, 329, 329 n. I, 365, 371, 

 377 n. 2. 



Nature stronger than nurture, 134, 



J 35- 

 Nautilidae among the earliest 



fossils, 5, 30 ; rapid decline of, 41. 



Nearctic, see America, North. 



Neave, S. A., on transition between 

 African butterflies, 69 ; results ob- 

 tained by, quoted in Essay X, 293 ; 



