1 N ! 





Dichogamy, i 94 ; Dclpinoon. ii. 257 ; 

 ignorance of botanists of, prior to pub- 

 lication of Fertilisation of On'.. 

 ii. 254 



1>k1<, Sir T. Lauder, Survey of Glen 

 Roy by, ii. 175 



Dickens, quotation from, ii. 446 



I >i( 1 ;i in, l ii ,, ii 



on, W. K , i. 6 



tyledons, Heer on old< 1 known, 

 ii. 2 ^Q : sudden appearance, ii. 239 



Didelphys, i. 86 



Digestion, beneficial effect on plants, 

 ii. 407 



Dillwyn, paper in Gardeners' Chronicle, 

 ii. 24S 



Diluvium, tails of, ii. [49 



Dimorphism, in Cynips, i. 249, 250: 

 Darwin on, i. 222, 224, 229, 267,274, 

 29S ; difficult to explain, i. 356 ; and 

 mimicry, i. 265 ; in parasitic plants, 

 i. 262 ; Wallace on, i. 265 ; Walsh 

 on, i. 259 ; Weismann on Sexual, i. 

 356 ; in Cicadas, ii. 90 ; flowers 

 illustrating, ii. 280, 282, 299, 347-52; 

 Darwin knows no case in very 

 irregular flowers, ii. 351 ; in Melasto- 

 maceae, ii. 292, 293 ; in Linutn, ii. 

 320 ; in eight Natural Orders, ii. 

 282 ; in Primula, ii. 320, 321, 323, 

 327, 328 ; apparent cases due to mere 

 variability, ii. 3S4 ; explanation of, 



»• 373 



Dingo, i. 167 



Diodia, ii. 272 



Diceciousness, origin of, ii. 416 



Dioiura, experiments on, i. 349 ; ii. 

 381, 384, 401, 403 : response 

 stimuli, ii. 51, 394. 395; Curtis' 

 servation- on, it 384 



Difsacus, F. Darwin on, i. 369 



Dipterocarpus, survival during glacial 

 period, i. 473 



Direct action, i. 181,212, 213 235, 

 ii. 235 : arguments against, i. 

 306 : Darwin led to believe more in, 

 i. 214 ; Darwin's desire not to under- 

 estimate, i. 19S : Darwin's under- 

 estimates, i. 235, 300; facts proving, 

 i. 350. 389 ; Falconer on, i. 2 

 and hybridity, i. 319 : importance 

 i. 391-2; of pollen, i 2>o: variation 

 and, i. 300 



Direction, sense of, in animals, i. 3S5 



Disease. Dobell on Germs an 

 of, i. 235 



Dispersal (see also Distribution), of 

 seeds, i. 40, 416-19, 436, 440, 444, 

 445 ; of shells, i. 52 



Distribution. Forbes on, i. 52, 53, 95. 



VOL. II. 



1 land and sea in I 

 tim< 



436 ; i'.i 



>m 



plant-, ii. on, 



i. I l.S : ii. 17-2' 1 ; 1 



ii. II, 17 



. I »ai win on, i >f, i. 



87 : I ■ in, i. 203 



Divergence, Hooker on, i. 134 ; | 



ciple of, i. 99, 101, 109, 153, 

 Diversification, Darwin's 



the good of, i. 199 

 Dobell. 1 I.. letter to, i. 234-5 



. i. 127, 128, 138, 167, 168; descent 



of, i. 387 ; experiment in painting, ii. 



72 : Expression, ii. 101 ; habits, ii. 102; 



rudimentary tail inherited in certain 



sheep-, ii. 382 

 Dohrn. Dr.. visits Darwin, i. ],2'-,: 



serves in Franco-Prussian war, ii. 92 ; 



extract from letter to, ii. 444 

 Dolomit Riffe, Darwin on Mojsiso\ 



i. 374; ii. 197 

 Domestic animals, crossing in. i. 2 



rwin's work on. i. 493; ii. 37; 

 - tegast on, i. 324; variability 



i. 137, 182, 191 ; treatment in Varia- 



tion of Animals and Plants, i. 16S 

 Domestication, effects of, i. 131, 134. 



137. 192, 2^2: and loss of sterility, 



Domeyko. on Chili, ii. 144 



Dominant forms, i. 165, 207 



Don, D., on variation, i. 102 ; men- 

 tioned, i. 403 



Donders, F. C, on action of eyelids, ii. 

 100; letters to, 100. 101, 104, 105, 

 108, 109 



Dorkings, power of flight, ii. 54 



., description of house and coun- 

 try, i. 31 6; Darwin's satisfaction 

 with his house, ii. 244 ; instance 

 vitality of led from. ii. 



245 ; method of determining plants 

 at. ii. 330 ; Darwin ot 

 ii. 165 ; observations on regular !. 

 of Right of bees at. ii. 97 



Down (lanugo), on human body, ii. 39 



Dropnn.: 



1'. Darwin's experiments, i. 

 9; "a disguised animal." ii. 2 J 

 Darwin's ol servations on, ii 200, . 



■. 320,381, 384, 3 396, 



401, 406-S ; Darwin's pleasure on 

 proving digestion in. ii. 3 

 inorganic substance on, u | eri- 



ments on absorption oi poison, ii. 

 290: Pfeffer on, ii. 400; J.Scott's 



SO 



