INDEX. 



Age of parents influencing sex, 29, 30 



Algae, reproduction in, 119, 120 



Allantois, 230 



Aloe, 225 



Alternation of generations, 185-199, 



212, 213 

 Alternation of generations in plants, 



185, 194, 195 



Altruism, development of, 257-259 



Amnion, 230 



Amphibians, parental care of, 233 



234 ; amatory emotion of, 245 

 Anabolism, see Protoplasm 

 Angiostomum, 67, 192 

 Animalculists, 79, 81, 147, 148 

 Anther cells, crystals in, 123 

 Aphides, 40, 158, 161, 163, 208, 261 

 Apospory, 190 

 Archoplasm, 92 

 Argonauta, 227, 228 

 Arthropods, hermaphroditism among, 



68 

 Ascaris, ovum of, 136, 137 

 Asexual reproduction, 175-184 

 Aura seminalis, 148 

 Amelia, alternation of generations, 



186, 187 



Baer von, discovery of mammalian 

 ovum, 81 



Balbiani on isolation of sex-cells, 86, 

 87 ; conjugation of Protozoa, 140 



Balfour on polar bodies, 100 ; on 

 parthenogenesis, 168 



Barry, Martin, 134 



Bary, De, on fertilization, 150 



Bees, sex characters, 37; partial par- 

 thenogenesis, 160, 161 ; reproduc- 

 tion in, 173 



Beneden, Van, on origin of sex-cells, 

 86; on polar bodies, 100; on fer- 

 tilization, 136 



Bichat's analysis, 81 



Bilharzia, 67, 245 



Bird of Paradise, 4 



Birds, sexual characters, 6 ; sexual 

 selection in, 9, 10; eggs, 97, 98; 

 love among, 246, 247 



Blackcock, 6 



Blochmann on polar globules, 99, 168 



Body versus reproductive cells, 87, 88, 

 240-242 



Bonellia, 17, 18 



Boveri on archoplasm, 92 ; on fertiliza- 

 tion, 136-139, 150 



Brood-chambers, 234, 235 



Brooding, 56, 57 



Brooks on sexual selection, 9-12 ; 

 theory of sex, 112, 125 ; on fertiliza- 

 tion, 155 



Biichner on love among animals, 246 



Biitschli on extrusion of polar globules, 

 99, 100 



Buffon, 276 



Butterflies, 23, 24, 40 



Canestrini, theory of sex, 29 



Carnoy on fertilization, 136, 137 



Castration, effects of, 19 



Cecidomyia, 225 



Cell-cycle, 112 



Cell-division, 205, 206, 215, 216, 236 



Cell-theory, 81, 82 



Chara, reproductive organs of, 123 



Chironomus, separation of sex-cells 

 in, 86, 87, 162 



Chambers, Robert, on prolonged ges- 

 tation, 277, 278, 283 



Claspers, 56, 228 



Coccus insects, 14, 17 



Ccelebogyne, 164 



Ccelenterates, reproductive organs, 

 53 ; hermaphroditism, 66 ; origin of 

 sex-cells, 86 ; asexual reproduction, 

 179, 180; alternation of generations, 



193 



Color, animal, 20 



Color, floral, 284 



Comparative vigor, theory of, 31 



Conjugation, 142, 150, 151 



Conjugation, multiple, 141 



Continuity of cells, 280 



Continuity of germ-plasma, see Weis- 

 mann 



Copulation, 226-228 



Co-operation, 286 



Crime among animals, 253. See 

 Cuckoo 



Crustaceans, sex in, 41 ; partheno- 

 genesis in, 162 



Cuckoo,, habits of, 253-257 



Cupid's dart, 228 



Cutleria, reproduction in, 120 



Cuttlefishes, organs of, 55 ; fertiliza- 

 tion in, 56 ; egg-clusters of, 253 



Darwin on sexual selection, 7, 12, 21, 

 23, 24; on determination of sex, 32, 

 33 ; on cross and self-fertilization, 

 130; on population question, 267, 

 268 ; natural selection, 278, 279 



Darwin, Erasmus, 276 



