INDEX 



475 



Otter-sheep, 291 



Owen, Sir Richard, on cells, 198 

 Oxalis, crosses between different 

 species of, 255 



Paxgexes, the, of de Vries as 

 bearers of constituent qualities, 

 15 ; their miscibility, 15 ; com- 

 pared with biophors, 42 



Papilio turnus, 375 



Pfliiger, the hereditary substance 

 only an infinitesimal part of the 

 egg-cell, 22 ; influence of gravity 

 on the development of frogs' eggs, 



135 

 Phanerogams, budding in, 216 



Philippeaux on regeneration in 

 Tritons, 118 



Phylogeny, 77 ; parallelism be- 

 tween phylogeny and ontogeny. 

 80; of the process of fission in 

 the Metazoa, 151 ; of regenera- 

 tion, 114; of gemmation, 168; 

 of the apparatus for transmission, 



451 

 Pigeons, reversion to the rock- 

 pigeon, 323, 352 ; increase of a 

 character by selection, 426, 427 

 Plasomes, the, of Wiesner, 20 

 Plastidules, the, of Haeckel, 41 

 Plumularia, budding in, 155 

 Podocoryne cornea, 158 

 Polydactylism, the transmission of, 



373. 429 



Polymorphism, 374; of animal and 

 plant stocks, 376, 462 



Polyommatus phlieas, 399, 420 



Polyzoa, budding in, 158; forma- 

 tion of buds from different cells, 

 165; ' blastogenic ' germ-plasm, 

 218 



Primula acaulis, reversion to long- 

 stalked variety in, 16 



Protohippus, 334 



Rath, O. vom, on threads of ' linin ' 

 between the idants, 244; on the 

 phenomena of reduction in the 

 germ-cells of Arthropods, 250 



Rauber, supposed priority as re- 

 gards the view of the continuity 

 of the germ-plasm, 200 



Ray Lankester on the non-transmis- 

 j sion of acquired characters, 396 

 ■ Reducing division of the germ- 

 plasm, II, 22, 235; consists in 

 the extrusion of ids, 240 ; influ- 

 ence on the composition of the 

 germ-plasm, 242; cause of dif- 

 ference between children of the 

 same parents, 257; in its relation 

 to reversion, 306 



Regeneration, its cause and origin 

 in the idioplasm, 93; constitutes 

 an arrangement for protection, 

 93; physiological, 94; of the 

 epidermis, 95; palingenetic, 105; 

 coenogenetic, 108; of the caudal 

 region of the vertebral column, 

 109; phylogeny of, 114; physio- 

 logical and pathological, 119; 

 depends on adaptation, 119; in 

 fishes, birds, and mammals, 120; 

 difterence of the capacity for in 

 lower and higher animals, 124; 

 acquired by selection, 125; facul- 

 tative or polygenetic, 126; in 

 plants, 132; formation of callus, 

 133; in animal embryos, 134; of 

 segmentation - cells, 139; sum- 

 mary, 225, 455 



Reisseck, on crosses between Cytisus 

 laburnum and C. purpureus, 343 



Reproduction, sexual, 230, 457; its 

 effect, 240 ; in Man, and trans- 

 mission of parental characters, 

 257; by fission, 456 



Reversion in plant-hybrids, 299; to 

 the pure ancestral form, 305; in 

 Man, and the crossing of different 

 races, 308; to a grandparent, 309; 

 to characters of remote ancestors, 

 316; in Datura, 317, 321; to an- 

 cestral forms of flowers in plants, 

 305; to rudimentary characters, 

 333 ; in gemmation, 338; in par- 

 thenogenesis, 344; sexual, 367; 

 in bud-variations, 447, 45S 



Rhabditis nigrovenosa, segmenta- 

 tion of ovum, 195, fig. 15; germ- 

 track of, 196 



Roux, W., on the purpose of the 

 apparatus for division of the nu- 

 cleus, 26; on the struggle of 



