INDEX. 



343 



in, 63 ; in receptacular tubes, (fig. 

 14) 68, (fig. 28) 95, (fig. 30) 97 ; 

 sepaline, of Salvia, 55 ; as origin 

 of the staminal and carpellary, in 

 Malvacea;, 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, 

 irregular, 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, Ypornoea, 161 ; 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. See 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 

 on, 178; disadvantages of, 314; 

 rationale of, 312 ; stimulus pro- 

 duced by, 312 ; views of Mr. Darwin 

 on, 315 



Crxiciferoi, 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- 

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

 to weight of insects, 110, 111 



Degeneracy and degradation, of an- 

 drcecium, 273 ; and androdioecism, 

 227 ; and anemophily, 266 ; of 

 flowers, 251, seqq.; in inconspicuous 

 flowers, cause of, 251 ; in Orchids, 



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



self- fertilisation, 252, seqq. 

 Development, of floral whorls, 191, and 



continuous during flowering, 122 ; 



order of, of parts of flowers, relative 



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



193 

 Dialysis, explained, 5, 50 ; in Mimu- 



lus, {i\g. 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 



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, ^Ir. Darwin's 



views on, 336; influence of, 158; 



origin of species through, 329, 



seqq. See Preface. 

 Epidermis, origin of root hairs on, 



(fig. 42), 137 

 Eranthis, arrangement 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 



