INDEX 



471 



and C /Kr/Mrifa, 340; 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 Ballola 

 nigra, 446 



Datura ferox and D. la;vis, reversion 

 of hybrids to an unknown an- 

 cestral form, 317 



Davenport, on budding in Polyzoa, 



159 

 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 

 detinitely 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 



Dianthus chinensis and D. barbatus, 

 crosses between, 302 ^ 



Dichogeny in plants, 1 14, 380, 462 \ 



Dicyemida;, 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 Fapilio 

 titniiis, 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, 



"9 

 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, 33 

 Eudendrium, budding of, 155, 156, 

 fig. 6 



Ferns, regeneration and gemma- 

 tion, 215 



Fertilisation, essential part of the 

 process, 232 



Fission in Naidx-, 146; in Micro- 

 stomidtc. 149, 456 



Flemniing, on nuclear division, 23; 

 on the splitting of the chromo- 

 somes in nuclear division, 25, 68 



Focke, on plant-hybrids, 261; on 

 hybrids of Nicotiana, 267; on 

 reversion in hybrids, 299; on re- 

 crossing, 302; on ' xenia,' 383 



