ANALYTICAL INDEX 



Darkening of hind wing in Guiana 

 mimetic butterflies, 272, 273, 331, 

 332. 



DARKENING, RECENT, OF N. 

 ENGLISH MOTHS, X. 308, 309, 309 

 n. i, 310, 310 n. i. 



Darwin, Charles (see also Descent 

 of Man, &c., Different Forms of 

 Flowers, Further Letters of, Life 

 and Letters of, Origin of Species, 

 Variation under Domestication) : 

 continuity the difficulty in the sys- 

 tematic work of, xv ; on Mutation as 

 expressed in the Vestiges, xviii,xix; on 

 the creative power of Natural Selec- 

 tion, xxiii ; Bateson's and Gregory's 

 work on the primrose compared with 

 that of, xxvii-xxxiv ; researches upon 

 heterostyled plants by, xxvii-xxix ; 

 on the value of the heterostyled con- 

 dition, xxvii-xxix ; the importance 

 of minute variations assumed by, 

 xxxix; individual differences con- 

 sidered of far greater importance 

 than large single variations by, xl, 

 xl n. 3, xli ; letter to Wallace aban- 

 doning evolution by large single 

 variations, 3 ; on pre-Cambrian time, 

 5,6; troubled by Lord Kelvin's views, 

 6, 1 1 ; on persistence of oceanic and 

 continental areas, 21, 22 ; influence 

 of, upon biological reasoning, 32, 

 33 ; definition of species by, 46, 47 ; 

 on species and varieties, 47 ; on prim- 

 rose and cowslip as true species, xxvii i, 

 47 1 63 ; on constancy as a criterion of 

 species, 47, 63 ; natural selection as 

 conceived by Wallace and, 48 ; 

 special value of letters of, 48 ; life of 

 Burchell compared with that of, 49, 

 50 ; on theological aspect of species, 

 56 ; the joint essay (1858) of Wallace 

 and, 58,95-7, 194-6: see also Darwin- 

 Wallace theory ; on various defini- 

 tions of species, 59 ; on evolution 

 and systematic work, 59 ; on subjec- 

 tive side of systematic work, 59, 60 ; 

 definition of ' close species ' by, 67 ; 

 on describing species, 67 ; on sus- 

 ceptibility to different conditions, 

 73-4 ; on effect of conditions on 

 plants, 74, 75 ; on interspecific 

 sterility, 77-80, 201 ; on sterility 

 between selected races, 78-80 ; 

 suggestion to W. B. Tegetmeier by, 

 79 ; on domestic animals derived 

 from two or three species, 79 ; con- 



troversy on interspecific sterility 

 between Wallace and, 80, 89 ; on 

 fertile pairing of two species of goose, 

 83 ; on fertility promoted by domesti- 

 cation, 83, 84 ; on sterility caused 

 by asyngamy, 84 ; on preferential 

 mating, 86, 87 ; on sterility not due to 

 selection, 89 ; on heterostyled plants 

 and interspecific sterility, 90, 91 ; on 

 injurious effects of self-fertilization, 

 92 ; metaphor of tree by, 94 ; on 

 origin of life, 95 ; on failure to under- 

 stand Selection, 102 : see also 96 ; 

 term 'Natural Selection' proposed by, 

 105 ; on Selection a true cause, 109 ; 

 theory of pangenesis of, 123-7 ; 

 chief reason for adoption of pan- 

 genesis by, 126 ; unaware of the im- 

 portant second edition of Prichard's 

 work, 175, 175 n. I ; views of, on 

 formation of domestic breeds essen- 

 tially similar to those of Prichard, 

 1 86, 187 ; J. C. Prichard as a remark- 

 able predecessor of Wallace and, 192; 

 on instincts of Fossorial Hymeno- 

 ptera, 160, 161 ; and of worker ants, 

 165 ; discovery of Natural Selection 

 by, 193, 194; consults Lyell and 

 Hooker about publication of Natural 

 Selection (1858), 194; disappointed 

 at reception of early geological 

 writings (1844 or 1845), 196, 197 ; 

 on mimicry and affinity, 233, 

 233 n. i ; on sexual selection as 

 cause of mimicry, 225, 228, 272, 

 272 n. i ; theory of sexual selection 

 f 379 > sexual selection set forth in 

 the joint essay (1858) by, 379. 



Letters of, referred to in present 

 work : to H. W. Bates, 86 ; Victor 

 Carus, xl n. 3 ; Asa Gray, xxvi, 66, 

 67, 68, 194 n. i ; J. D. Hooker, 59, 

 60, 63, 67, 76, 84, 86 ; T. H. Huxley, 

 78, 79, 80, 82, 91, 126, 196; C. Lyell, 

 56, 75, 83, 83 n. 2 ; R. Meldola, 225, 

 228, 233, 272 n. i (although Meldola's 

 name is not mentioned in this foot- 

 note) ; Carl Semper, 74 ; W. B. 

 Tegetmeier, 79 ; A. R. Wallace, xl n. 

 3, 3, 6 ; from Hooker to, 74, 74 n. 3 ; 

 from Huxley to, 4 n. 2, 196. 



Darwin, Erasmus, theory of evolu 

 tion of, 98 ; use of term ' acquired ' by 

 (1794), 140, 141 ; on effect of parental 

 imagination on offspring, 180. 



Darwin, Francis, on influence of 

 Fleming Jenkin upon Charles Darwin, 



