INDEX. 



Age of parents influencing sex, 34, 



35 

 Algae, reproduction in, 126, 127 

 Allanlois, 249 

 Aloe, 243 

 Alternation of generations, 200-215, 



229, 230 

 Alternation of generations in plants, 



201, 210, 211 



Altruism, development of, 279-2S1 



Amnion, 249 



Amphibians, parental care of, 253, 



254 ; amatory emotions of, 265 

 Anabolism, see Protoplasm 

 Angiostomum, 71, 208 

 Animalculists, 83, 84, 157, 158 

 Anther cells, crystals in, 131 

 Aphides, 45, 46, 169, 172, 173, 175, 



225, 283 

 Apospory, 206 

 Archoplasm, 98 

 Argonauta, 246, 247 

 Arthropods, hermaphroditism 



among, 72 

 Ascaris, ovum of, 145, 146 

 Asexual reproduction, 188-199 

 Aura seminalis, 158, 159 

 Aurelia, alternation of generations, 



202, 203 



Baer, Von, discovery of mammalian 



ovum, 86 

 Balbiani on isolation of sex-cells, 



92 ; conjugation of Protozoa, 149 

 Balfour on polar bodies, 106 ; on 



parthenogenesis, 180 

 Barry, Martin, 142 

 Bary, De, on fertilisation, 160 



Bees, sex characters, 42 ; partial 

 parthenogenesis, 172; reproduc- 

 tion in, 185, 186 



Beneden, Van, on origin of sex- 

 cells, 91 ; on polar bodies, 106 ; 

 on fertilisation, 145 



l^ichat's analysis, 86 



Bilharzia, 71, 265 



Bird of Paradise, 4 



Birds, sexual characters, 6, 7 ; sexual 

 selection in, ii ; eggs, 103 ; love 

 among, 266, 267 



Blackcock, 7 



Blochmann on polar bodies, 105, 

 180 



Body versus reproductive cells, 93, 

 260-262 



lionellia, 20 



Boveri on archoplasm, 98 ; on fer- 

 tilisation, 145-148, 160 



Brood-chambers. 255 



Brooding, 63 



Brooks on sexual selection, 10-12; 

 theory of sex, 118, 132; on fer- 

 tilisation, 166 



Biichner on love among animals, 

 266 



Biitschli on extrusion of polar glo- 

 bules, 106 



Buffon, 300 



Butterflies, 28, 46 



Canestrini, theory of sex, 34 



Carnoy on fertilisation, 145, 146 



Castration, effects of, 23 



Cecidomyia, 243 



Cell-cycle, 118 



Cell-division, 221-223, 233, 234, 256 



