INDEX. 



843 



in, 63 ; in receptacular tubes, (fig. 

 14) 6S, (tig. 28) 95, (fig. 30) 97 ; 

 sepaline, of Salvia, 55 ; as origiu 

 of the staminal and carpellary, in 

 MalvacecB, 43, 44 



Corollas, appendages to, origin of, 133,^ 

 seqq. ; form of, 101, seqq. ; meta- 

 morphoses of, 292, 301 ; movements 

 in, of Genista, (fig. 47) 160 ; of 

 Lopezia, (fig. 48) 161 ; origin of, 

 irreguhir, 103, seqq.; petals of, 

 displacement of, by insects, (figs. 

 .33-35) 110, 111; polliniferous, 

 292, 293 ; progressive metamor- 

 phoses of, 292 ; reduction of size 

 of,9, 254, in Geranium, 252; regular 

 and irregular, 101, seqq.; sensi- 

 tiveness in, Ypomaa, \6\ ; stameni- 

 ferous. (figs. 72, 73) 292, 293; 

 strains, effect of, on the formation 

 of, 101, seqq., 126; structure of 

 bilateral, 116, seqq. ; virescence of, 

 (figs. 83, 84) 301, seqq. i'et? Petals. 



Correlation of growth, 112, 113, 

 117 ; irregularities by, 108 



Cross-fertilisation, advantages of, in 

 evolution of species, 330, and in 

 horticulture, 311; colour, effects 

 ou, 178; disadvantages of, 314; 

 rationale of, 312 ; stimulus pro- 

 duced by, 312 ; views of Mr. Darwin 

 on, 315 



CrucifercB, anatomy of floral recep- 

 tacle, (fig. 6) 32 ; symmetry of, 

 32 



D 



Darkness and colours, 177 



Declinate stamens, in Dictamnus, (fig. 

 33) 110; distribution of forces in, 

 of Echium, (fig. 20) 82 ; of Epilo- 

 hium, (fig. 34) 111 ; origin of, due 

 to weight of insects, 110, 111 



Degeneracy and degradation, of an- 

 drcecium, 273 ; and androdioecisra, 

 227 ; and anemophily, 266 ; of 

 flowers, 251, seqq.; in inconspicuous 

 flowers, cause of, 251 ; in Orchids, 



172, 281,319; origin of, 282 ; and 



self- fertilisation, 252, seqq. 

 Development, of floral whorls, 191, and 



continuous during flowering, l'J2 ; 



order of, of parts of flowers, relative 



only, 195; rates of, in pistil, 192, 



193 

 Dialysis, explained, 5, 50 ; in Mhnu- 



lus, (fig. 10) 51 

 Diclinism, and heterostylism, 228 ; 



partial, 220 ; in primitive flowers, 



337 

 Dimorphism, and fertilisation in Viola 



tricolor, 255 ; and heterostylism, 



203 ; in stamens, (fig. 37) 121 

 Dioecism, and heterostylism as cause 



of, 218; of primitive flowers, 337 

 Domatia, hereditary formation of, 



115, 142, 157 

 Doubling, causes of, 298 

 Drosera, metamorphoses of tentacles 



of, into ovules, 307 

 Duvernoia, zygomorphism of, origin 



of, (fig. 31) 107 



E 



Electricity, effects on protoplasm, (fig. 



45) 152, on nucleus, 154 

 Emergence, alteration in order of, in 



regular and in irregular flowers, 



187 ; and development of ovules, 



195, and interpretation of, 196; of 



floral whorls, 184; order of, 184 

 Energy, reproductive and vegetative, 



231, seqq. 

 Environment, action of, Mr. Darwin's 



views on, 336; influence of, 158; 



origin of species through, 329, 



seqq. See Preface. 

 Epidermis, origin of i-oot hairs on, 



(fig. 42), 137 

 Eranthis, ari'angement and number of 



parts in flower of, 22 

 Exclusion, of insects from flowers, 



102, 133, seqq. 

 Excrescences, on corolla, (fig. 87) 



306 ; on cabbage-leaves, as homo- 



logues of ovules, 307 



