474 



INDEX 



Increase of a character by crossing, 



424 

 Individual jirepotency, 291 

 Ivy, III; dichogeny in, 380 



Jager, Gustav, supposed priority 

 as regards the hypothesis of the 

 continuity of the germ-plasm, 200 



Kennel, regeneration of beak of 

 stork, 125; division, 150 



Kiwi {Apteryx), disappearance of 

 wings, 82 



Kleinenberg, development of Lum- 

 brictis trapezoiiies, I 70 



Kolreutter, crossing of AHcotiana 

 rustica and A^ paniculata, 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, 



155 

 Leptodora hyalina, development of, 



176; sexual characters of, and the 



theory of determinants, 363 



Leuckart, Rutlolph, discovery of 

 parthenogenesis in bees, 356; on 

 the combination of secondary 

 sexual characters in hermaphro- 

 dite bees, 360 



Leydig, regeneration in lizards, no, 

 116 



Liebscher, crossing of Ilordeiim 

 steiidelii and //. trifiircatum, 301 



Loeb, gemmation in Tiibidaria 

 mesenibryantheniiivi, 216 



Lumbriculus, regeneration in, 126, 



Lucas, Prosper, on transmission of 

 polydactylism, 373 



Lycaena, as illustration of the theory 

 of determinants, 58, 62; L. adonis 

 and Z. agestis, 87; colouring and 

 dimorphism of, 359, 373; varia- 

 tion in, 422 



Marrubium vaillantii, 270 



Marsh, on supernumerary toes in 

 horses, 334 



Medusae, formation of germ-cells, 

 187 ; 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 inhnitesimal 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. langsdorffii, 300 



Nipples, supernumerary, in human 

 beings as examples of reversion, 



333 

 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, 32 ; 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 



