292 



INDEX. 



Darwinism, 286-288 



Death, origin of, 235, 239-241 



Dichogamy, 69 



Diplozoon, 228 



Division of labor, 179 



Drones, nature of, 16 



Ducts of reproductive organs, 54 



Diising on the proportions of the 



sexes, ss ; on sex-determination, 



41, 42 



Echinodermata, hermaphroditism 

 among, 68 



Ectocarpus, reproduction in, 120 



Edible bird's nest, 231 



Egg-cells, see Ovum 



Egg, chemistry of the, 98 



Egg-envelopes, 97 



Egg-laying organs, 56 



Egg-shell, 97, 98 



Egoism, 257-259 



Eimer on humble bees, 38; on cuckoo, 

 257 ; on evolution, 281 



Embryology, 78-81, 85-87, 92-99, 106, 

 108 



Encystation, 179, 239 



Englemann on dimorphism in Proto- 

 zoa, 121 



Environment, influence of, 217-219; 

 transmission of acquired characters, 

 280, 281 



Epigenesis, 78-81 



Ethical aspects of nutrition and repro- 

 duction, 257-259 



" Evolution " in old sense, 78-81 



Evolution, theories of, 276-281 ; re- 

 productive factor in, 276-288; essen- 

 tial problems of, 287, 288 



Fallopian tube, 224 



Females, 1-46 passim; passivity, 14, 15; 

 size, 18 ; preponderant anabolism, 

 22 ; psychical characters of, 247-250 



Fern, alternation of generations, 189 



Fertilization, time of, 29; in plants, 

 130 ; details of, 135-139 ; nuclear 

 union in, 136 ; duality of, 139 ; in 

 Protozoa, 139; origin of, 141-143 ; 

 theory of, 147-157 ; uses of, 152-156; 

 a source of variation, 277 



Fish, sex differences in, 5, 25 ; paren- 

 tal care of, 234, 235 ; amatory 

 emotions of, 245 



Flower, position of, 209; origin of, 284 



Fluke, alternation of generations, 189, 

 191 



Follicular cells, 97 



Free-martin, 34 



Fungi, parthenogenesis in, 164 



Gall-wasps, parthenogenesis in, 163 

 Galton, contrast between body and 

 sex cells, 88 ; on fertilization, 152 



Gastrula, 80, 285 



Gegenbaur on origin of yelk gland, 



55 ; on hermaphroditism, 74 

 Gemmules of fresh-water sponge, 193 

 Genesis, 262 



Gentry on sex in moths, 40 

 Germiparity, 27, 60 

 Germ-plasma, see Weismann 

 Gestation, length of, 229 ; influence of 



prolonged, 278 

 Girou on sex, 29, 41 

 Goette on origin of death, 217; on 



nemesis of reproduction, 236 

 Gonads, or essential reproductive 



organs, 51-58 

 Graaf, 79 



Graafian follicle, 224 

 Growth, 203-214 



Gruber on reproduction of Protozoa, 

 211 



Gyrodactylus, 192, 225 



Haeckel on continuity of reproduc- 

 tion, 88; on Protomyxa, 113; on 

 alternation of generations, 198; on 

 Magosphaera, 236 



Haller, 79, 80 



Hamm, discovery of spermatozoon, 

 103 



Harvey, 78 



Hatschek on fertilization, 156; on 

 nutrition and reproduction, 210 



Hectocotylus, 55, 227 



Hensen, theory of sex, 29 ; on fertiliza- 

 tion, 153 



Heredity, see Weismann ; in alternat- 

 ing generations, 195, 196 ; acquired 

 characters, 280-281 



Hermaphroditism, 60-76 ; embryonic, 

 60 ; casual, 61 ; partial, 62 ; normal, 

 65 ; degrees of, 69 ; conditions of, 

 73 ; origin of, 74 



Hertwig on hermaphroditism, 63 ; on 

 fertilization, 149 



Heyer on sex in plants, 42 



Hofacker and Sadler's law, 29, 31 



Hofacker on determination of sex, 29 



Hunger and love, 257-259 



Hybridization, 143-145 



Hydra, 53, 175, 20S 



Hydractinia, 179 



Hvdroids, alternation of generations, 

 186 



Immortality, organic, 238-242 



Incubation, 232-235 



Individuation, 262-264, 2 68, 269 



Insects, sex characters of, 5, 10, 14, 

 16; determination of sex in, 37-40; 

 hermaphroditism of, 65 ; partheno- 

 genesis in, 163 



Isophagy, 150 



