222 



INDEX. 



Gastrotricha, 96 



Gastro-vascular system, 132 



Gastrula, 187, 197 ; of amphioxus, 

 187 



Gastrulation, modified modes of, 

 188 



Gegenbaur, 21 



Gelatine, 102 



Gemmation, 81 



Generatio spontanea, 166 



Generations, alternations of, 172, 

 196 



Generation by parents, 168, 195 ; 

 asexual, 196 ; sexual, 196; spon- 

 taneous, 37 



General embryology, 165 



Geography, animal, 211 



Geographical distribution of ani- 

 mals, 210; isolation, Wagner's 

 theory of, 63 



Geology, its part in the overthrow 

 of the cataclysm theory, 28 



Germinal epithelium, 140; of Me- 

 dusa, 94 



Germinal glands, 140 



Germ-layer, theory, 21; the middle, 

 189 



Germ-layers, 171 ; formation of, 

 187 ; inner G. -layer, 187 ; outer 

 G. -layer, 187 



Germinal spot, 97; vesicle, 97 



Giant cell of the marrow, 83 



Gills, 123, 128 



Gill-slits, 129 



Gizzard, 127 



"Gland-cells," 92 



Glands, 92 ; acinous, 93 ; forma- 

 tion of, 92; germinal, 140; multi- 

 cellular, 92 ; tubular, 93; unicell- 

 ular, 92. 93 



Glandular epithelia, 89, 92; sensory 

 epithelia, 88 



Glue, 102 



Glutin, 102 



Goblet-cells, 91, 92 



Goethe, 16, 26 



Gceze, 15 



Gonochorism, 141, 158 



Granules, the secretory, 92 



Grasshopper mimicry, 58 



Grew, N., 70 



Gromia oviformis, 76 



Gut, 124 



Haeckel, 21, 29 

 Htemocyanin, 108 

 Haemoglobin, 107 ; oxy-, 107 ; "re- 

 duced," 107 

 Harvey, 165 



Haversian canals, 105; lamellse, 104 



Hearing, organs of, 151 



Heart, 132 ; higher development 

 of the, 132 



Heat-rigor, 77 



heliconia, 57 



Hepato-pancreas, 127 



Hereditary substance, the, 81, 181 



Heredity, 181 ; material basis of, 

 181; the bearer of, 80 



Hermaphroditism, 141, 158; occur- 

 rence of, 142 ; true, 143 



Heterocercal tail, 48 



Heterogony, 172, 174, 197 



Heteronomy, 165 



Hind-gut, 126 



Histology, 21 



Histological differentiation, 116 



History of zoology, 7 



Hooker, 30, 70 



Homocercal tail, 48 



Homoiothermous, 137 



Homologous organs, 157 



Homology, 16, 120 



Homonomy, 165 



Horn, 91 



Horse, phylogeny of, 40 



Human embryo, third to fourth 

 week, 42; compared with a tad- 

 pole, 42 



Huxley, 21, 30 



Hybrids and mongrels, the fer- 

 tility of, 34 



Hydra in optical section, 169 



Hypoblast, 188, 197 



Idiothermous animals, 137 



Inbreeding, 35 



Indirect nuclear division, 82; de- 

 velopment, 193 



Inflammation, 87 



Ingluvies, the, 127 



Inorganic bodies, 158 



Insects of Kerguelen Islands, 55 



Intercellular substance, 100 



Integument of insects, 90 



Intercrossing, effects of, 62; of 

 species, the, 33 



Interrelation of cytoplasm and 

 nucleus, 83 



Intestine, large, 127; small, 127 



Invagination, 188 ; formation of 

 gastrula by, iSS 



Iris, 156 



Irritability, 75, 121; of animals, 121 

 of plants, 121 ; of protoplasm, 121 



Ivory, 105 



Karyokinesis, 82, 84 



