ANALYTICAL INDEX 



4i5 



Darkening of hind wing in Guiana 

 mimetic butterflies, 272, 273, 331, 



33 2 - 



Darkening, Recent, of N. 

 English Moths, X. 308, 309, 309 

 n. 1, 310, 310 n. 1. 



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, 11 ; 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, xxviii, 

 47, 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, 

 186, 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), ! 9 6 > 1 97 5 

 on mimicry and affinity, 233, 

 233 n. 1 ; on sexual selection as 

 cause of mimicry, 225, 228, 272, 

 272 n. 1 ; theory of sexual selection 

 0I > 379 j 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. 1 ; 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, 186. 



Darwin, Francis, on influence of 

 Fleming Jenkin upon Charles Darwin, 



