INDEX. 



319 



Gall-wasps, parthenogenesis in, 175 

 Gallon, contrast between body and 



sex cells, 93 ; on fertilisation, 163 

 Gastrula, 85, 310, 31 1 

 Gegenbaur on origin of yolk gland, 



61 ; on hermaphroditism, 78 

 Gemmules of fresh-water sponge, 



209 

 Genesis, 285 



Gentry on sex in moths, 46 

 Germiparity, 33, 66 

 Germ-plasma, see Weismann 

 Gestation, length of, 247; influence 



of prolonged, 302 

 Girou on sex, 34, 47 

 Goette on origin of death, 234 ; on 



nemesis of reproduction, 255 

 Gonads, or essential reproductive 



organs, 57-64 

 Graaf, 83 



Graafian follicle, 242 

 Growth, 219-230 

 Gruber on reproduction of Protozoa, 



228 

 Gyrodactylus, 207, 243 



Haeckel on continuity of repro- 

 duction, 93 ; on Protomyxa, 120 ; 

 on alternation of generations, 

 214; on Magosphaera, 255 



Haller, 83, 84. 



Hamm, discovery of spermatozoon, 

 109 



Harvey, 82 



Hatschek on fertilisation, 167 ; on 

 nutrition and reproduction, 227 



Hectocotylus, 62, 246 



Hensen, theory of sex, 34 ; on fer- 

 tilisation, 163 



Heredity, see Weismann ; in alter- 

 nating generations, 210, 211 ; 

 acquired characters, 304-306 



Hermaphroditism, 65-79; embry- 

 onic, 65 ; casual, 66 ; partial, 67; 

 normal, 70 ; degrees of, 72 ; con- 

 ditions of, 77 ; origin of, 78 



Hertwig on hermaphroditism, 68 ; 

 on fertilisation, 159 



Heyer on sex in plants, 47. 



Hofacker and Sadler's law, 34, 36 



Hofacker on determination of sex, 

 34 



Hunger and love, 279-281 

 Hybridisation, 153-155 

 Hydra, 59, 189, 225 

 Hydractinia, 193 



Hydroids, alternation of genera- 

 tions, 201, 202 



Immortality, organic, 258-262 



Incubation, 251-255 



Individuation, 285-287, 291, 292 



Insects, sex characters of, 5, 1 1, 

 16-19 5 determination of sex in, 

 42-46 ; hermaphroditism of, 69- 

 70; parthenogenesis in, 174, 175 



Isophagy, 161 



Jteger on continuity of germ-proto- 

 plasm, 93 



Katabolism, see Protoplasm 

 Knight, experiments on water- 

 melons, 48, 49 

 Kolliker on origin of spermatozoa, 

 no 



Lactation, 249, 250 

 Lamarck, 301 



Laulanie on embryonic hermaph- 

 roditism, 33, 66 

 Leeuwenhoek, 83, no, 158 

 Limit of growth, 220-224 

 Liverwort, 227 

 Love, 264-281 

 Love for offspring, 271-274. 

 Luciola, 25 



Magosphrera, 255 



Males, 1-50 passim; variability, 

 12, 13; activity, 17; size, 20; 

 pigmy, 17, 20, 75, 77; colour, 

 23 ; predominant katabolism, 

 26 ; complemental, 75, 77 ; psy- 

 chical characters, 304 



Male-cell, see Spermatozoon 



Malpighi, %Z 



Malthus, 284, 290, 291 



Malthusianism, 290-292 



Mammals, love among, 266, 267 



Mammary glands, 249, 250 



Mantegazza on sexual characters, 

 10, 14 



Marsupials, 252, 253 



