474 



INDEX 



Increase of a character by crossing, 



424 

 Individual prepotency, 291 

 Ivy, III; dichogeny in, 380 



JaGER, Gustav, supposed priority 

 as regards tlie hiypothesis of the 

 continuity of the germ-plasm, 200 



Kennel, regeneration of beak of 

 stork, 125; division, 150 



Kiwi {Apteiyx), disappearance of 

 wings, 82 



Kleinenberg, development of Licin- 

 hricus t7-apezoides, 1 70 



Kolreutter, crossing of Alcodana 

 rustica and vV. panictilata, 261, 

 269; on recrossing, 305 



Kowalewsky, on supernumerary toes 

 of horses, 334 



Kraepelin, investigations on her- 

 maphrodite bees, 361 



Lamarck, on the transmission of 

 acquired characters, 395 



Lang, A., the regenerative faculty 

 as an arrangement for protec- 

 tion, 93 ; budding in hydroids, 



Leptodora hyalina, development of, 

 176; sexual characters of, and the 

 theory of determinants, 363 



Leuckart, Rudolph, discovery of 

 parthenogenesis in bees, 356; on 

 the combination of secondary 

 sexual characters in hermaphro- 

 dite bees, 360 



Levdig, regeneration in lizards, no, 

 116 



Liebscher, crossing of Ilordeiiiii 

 steudelii and H. trifiircatum, 301 



Loeb, gemmation in Tubidaria 

 mesetnbryanthein lan, 216 



Lumbriculus, regeneration in, 126, 



'51 



Lucas, Prosper, on transmission of 



polydactylism, 373 

 Lycsena, as illustration of the theory 

 of determinants, 58, 62; L. adonis 

 and Z. agesiis, 87 ; colouring and 

 dimorphism of, 359, 373; varia- 

 tion in, 422 



Marrubium vaillantii, 270 



Marsh, on supernumerary toes in 

 horses, 334 



Medusse, formation of germ-cells, 

 1 87 ; degeneration into a mere 

 gonophore, 187 



Mesohippus, 334 



Meyer, O. E., on molecules, 86 



Micellar theory, 41 



Miescher-Rusch, on nuclein, 50 



Morphoplasm, 38 



Mules, transverse stripes of, indi- 

 cating reversion, 316; theoretical 

 explanation of stripes, 329; patho- 

 logical variation, 429 



Miiller, Josef, ' gamomachia ' and 

 ' gamophagia,' 296 



Nageli, Carl von, physiological 

 theory of descent, 9; the heredi- 

 tary substance constitutes only 

 an infinitesimal part of the egg- 

 cell, 22; the ' micella,' 41 ; on 

 variation, 41 1 ; the ibis and croco- 

 dile in connection with variation, 

 416; bud-variation, 442 



Nais, regeneration of, 126 



Naudin, experiments with Datura, 

 321 



Nicotiana rustica and N. paniculata, 

 crosses between, 261 ; difference 

 in the flowers of, 267; A", alata 

 and N. langsdoi-ffii, 300 



Nipples, supernumerary, in human 

 beings as examples of reversion, 



Nitsche, O., budding in Polyzoa, 



Nussbaum, artificial division in In- 

 fusoria, 52; idea of the continuity 

 of germ-cells, 201 



Oka, budding in Polyzoa, 159 

 Ontogeny, or development of the 



individual. 



?2 ; 



depends upon 



gradual changes in the germ- 

 plasm, 32; part played by deter- 

 minants in the course of, 80; can 

 only be explained by ' evolution,' 

 and not by epigenesis, 138; re- 

 sulting from the union of the 

 germ-plasm of two parents, 253 



