476 



INDEX 



parts, 107; on gravity producing 

 no effect in the differentiation of 

 the egg into the embryo, 135; 

 experiments on frogs' eggs, 136; 

 on post-generation, 142 

 Riickert, J., behaviour of chromo- 

 somes during maturation in the 

 ovum of the dog-fish, 50, 71, 



247 



Salhs, on the formation of callus, 

 133; on the growth of Chara, 

 164; on adventitious buds, 211 



Sagitta, embryogeny of, 185 ; course 

 of the germ-track of, 192 



Salamandra, regeneration of limbs, 



99 

 Salpie, budding in, 162; alternation 



of generations in, 180 

 Schreiber, on the regenerative power 



in Triton marnioratiis, 1 1 5 

 Seeliger, O., on budding — in Poly- 



zoa, 158; in Clavelina, 160; in 



SalpK, 162; in Pedicellina, 218 

 Self-differentiation of cells, 136 

 Semper, Carl, on the process of 



fission in A~ais, 147 

 Settegast, on infection of the germ, 



Siebold, von, on the determination 

 of sex in bees, 356; on hermaph- 

 rodite bees, 361 



Siren lacertina, regenerative power 

 in, 115 



Spallanzani, on the capacity for re- 

 generation in different organs, 

 117; in Triton, 120; in the jaw 

 of Triton, 125 



Spencer, Herbert, 'physiological 

 units,' 5 1 ; their relation to Dar- 

 win's ' gemmules,' 6; on heredity, 

 7; on regeneration, 104; regen- 

 eration compare<l with crystallisa- 

 tion, 128 



Stimuli considered as causing an 

 incitement to growth, 129 



Strasburger, on fertilisation in 

 Phanerogams, 23; on the essen- 

 tial similarity of male and female 

 nuclei, 23; on the dynamical 

 effect of nuclear matter, 45 



Struggle of individual characters, 

 274; of the ids in ontogeny, 260 



Supplementary determinants, 103; 

 their change in the course of 

 phylogeny, 112; in processes of 

 regeneration in Hydra, 127; an- 

 timeral, 131 ; the origin of, 149 



Syphilis, the transmission of, 388 



Tardigraua, extent of the heredi- 

 tary parts, 59 

 Telegony or infection of the germ, 



383 

 Termites, polymorphism in, 379 



Thuja, dichogeny in, 382 



Transmission <^see Heredity). 



Triton, 100; diagram of regenera- 

 tion of fore- limb in, 102, 115; 

 experiment on regeneration of 

 lung in, 117 



Tuberculosis, and infection of the 

 germ, 389 



Tubularia mesembryanthemum, bud- 

 ding in, 216 



Tunicata, budding in, 160 



Twins, 140; identical and dissimi- 

 lar, 254 



Type in a technical sense, 313 



Vanessa, levana and prorsa, 379 



Variation, intercalary remarks on, 

 271; theoretical demonstration 

 of, 410; normal individual varia- 

 tion, 410; cause of hereditary 

 variation, 415; pathological va- 

 riation, 428; summary of the 

 present view with regard to 

 variation, 431 ; variations on a 

 larger scale in plants. 435 



Verworn, M., view that the heredi- 

 tary substance is also contained 

 in the cell-body, 28 



Vilmorin, on individual potency in 

 plants, 291 



Vines, view that the assumption of 

 a special reproductive substance 

 is unnecessary, 202; on embry- 

 onic substance, 204 



Viola tricolor, reversion to the an- 

 cestral form, 320 



Vdchting, H., on 'transplantation 

 in the plant-body,' 129 



