INDEX 



471 



zwd C. purpurea, T,^0; on latent 

 primary constituents, 352; on 

 transmission of acquired char- 

 acters, 384, 394; on variation, 

 406, 410; on baldness in birds, 

 426; on the transmission of bud- 

 variations, 441 ; on the trans- 

 mission of a variation in Ballota 

 nigra, 446 



Datura ferox and D. Itevis, reversion 

 of hybrids to an unknown an- 

 cestral form, 317 



Davenport, on l)udding in Polyzoa, 



^59 . . . 



Degeneration in its relation to the 

 theory of determinants, 83 



Dejerine, on the transmission of 

 nervous complaints, 369 



Determinants or determining parts, 

 57; control groups of cells, 57; 

 are a group of biophors, 59; 

 possess special qualities, 60; are 

 definitely localised in the idio- 

 plasm, 61; constitute the ids, 62; 

 their forces of attraction, 66; 

 their behaviour in the course of 

 ontogeny, 69; their disintegration 

 into biophors, 69; their growth 

 and multiplication, 71; their 

 number, 89; supplementary de- 

 terminants, 103, 112, 127, 131, 

 149; the separation of a group 

 of, 153; their disintegration in 

 gemmation, 160; their separation 

 into groups in the development of 

 somatic cells, 209; their modi- 

 fication in the formation of galls, 

 222; control of the cell by the 

 combined influence of paternal 

 and maternal determinants, 261; 

 homologous and heterologous 

 determinants, 264; their con- 

 trolling forces, 269 ; number 

 of homodynamous determinants 

 varies in ontogeny, 271; homo- 

 dynamous and heterodynamous 

 determinants, 264, 278; proof of 

 their disintegration into biophors, 

 348; in cases of dimorphism, 

 355; variations due to changes 

 in their composition, 406, 418, 

 448 



Determinants, the theory of, 53; 

 summary, 225; reversion ex- 

 plained by, 335; applied to sex- 

 ual dimorphism, 366 



Determinates or hereditary parts, 57 



Dianthuschinensis and D. barbatus, 

 crosses between, 302 



Dichogeny in plants, 114, 380, 462 



Dicyemidne, distribution of heredi- 

 tary parts, 59 



Digitalis lutea and D. purpurea, 

 crosses between, 255 



Dimorphism, normal, 352; its basis 

 in the idioplasm, 354; patho- 

 logical, 370; double, in Papilio 

 turnus, 375 ; seasonal, 379, 462 



Diptera, course of germ-track, 192; 

 renewal of the alimentary epi- 

 thelium, 57 



Disarticulation of the limb of Triton, 

 in connection with the hypothesis 

 of supplementary determinants, 



.119 



Diseases, transmission of, 387; 



haemophilia, 370 

 Doubling of limbs in insects, 429; 



of whole groups of determinants, 



428 

 Driesch, experiments with eggs of 



sea-urchins, 137; on the blasto- 



meres of the frog, 141 



Elsberg, Louis, 41 

 Embryonic cells, t^t, 

 Eudendrium, budding of, 155, 156, 

 fig. 6 



Ferns, regeneration and gemma- 

 tion, 215 



Fertilisation, essential part of the 

 process, 232 



Fission in Naidoe, 146; in Micro- 

 stomidce. 149, 456 



Flemming, on nuclear division, 23; 

 on the splitting of the chromo- 

 somes in nuclear division, 25, 68 



Focke, on plant-hybrids, 261 ; on 

 hybrids of Alcotiajia, 267; on 

 reversion in hybrids, 299; on re- 

 crossing, 302; on ' xenia,' 383 



