3i8 



INDEX. 



Cell theor)-, 86 



Chara, reproductive organs of, 131 



Chironomus, separation of sex-cells 

 in, 92, 173 



Chambers, Robert, on prolonged 

 gestation, 302, 308 



Claspers, 62, 247 



Coccus insects, 17, 20 



Coelebog)'ne, 175 



Coelenterates, reproductive organs, 

 59, 60 ; hermaphroditism, 70 ; 

 origin of sex-cells, 91 ; asexual 

 reproduction, 193-195 ; alterna- 

 tion of generations, 209 



Colour, animal, 23, 24 



Colour, floral, 309 



Comparative vigour, theory of, 36 



Conjugation, 151, 152, 161 



Conjugation, multiple, 151 



Continuity of cells, 305 



Continuity of germ -plasma, see 

 Weismann 



Copulation, 245-247 



Co-operation, 311 



Crime among animals, 275. See 

 Cuckoo 



Crustaceans, sex in, 46 ; partheno- 

 genesis in, 174 



Cuckoo, habits of, 274-279 



Cupid's dart, 247 



Cutleria, reproduction in, 128 



Cuttlefishes, organs of, 62 ; fertilis- 

 ation in, 62 ; egg-clusters of, 274 



Darwin on sexual selection, 8-14, 

 25, 27, 29 ; on determination of 

 sex, 38 ; on cross and self ferti- 

 lisation, 138; on population ques- 

 tion, 290, 291 ; natural selec- 

 tion, 303, 304 



Darwin, Erasmus, 300, 301 



Darwinism, 312-314 



Death, origin of, 255, 260, 261 



Dichogamy, 73 



Diplozoon, 246, 247 



Division of labour, 193 



Drones, nature of, 19 



Ducts of reproductive organs, 60 



Dlising on the proportions of the 

 sexes, 38 ; on sex-determination, 

 47 



Echinodermata, hermaphroditism 

 among, 72 



Ectocarpus, reproduction in, 128 



Edible bird's nest, 250 



Egg-cell, see Ovum 



Egg, chemistry of the, 104 



Egg-envelopes, 102 



Egg-laying organs, 62 



Egg-shell, 103, 104 



Egoism, 279-281 



Eimer on humble bees, 44 ; on 

 cuckoo, 279 ; on evolution, 306 



Embryology, 82-86, 90-92, 97-105, 

 112-114 



Encystation, 193, 259 



Engelmann on dimorphism in Pro- 

 tozoa, 129 



Environment, influence of, 235, 236; 

 transmission "of acquired char- 

 acters, 304, 306 



Epigenesis, 82-86 



Ethical aspects of nutrition and re- 

 production, 279-281 



" Evolution" in old sense, 82-84 



Evolution, theories of, 300-305 ; re- 

 productive factor in, 300-315 ; 

 essential problems of, 313, 314 



Fallopian tube, 242 



Females, 1-50 passim; passivity, 

 17 ; size, 21 ; preponderant ana- 

 bolism, 26 ; psychical characters 

 of, 267-271 



Fern, alternation of generations, 

 205 



Fertilisation, time of, 34 ; in plants, 

 138; details of, 144-148 ; nuclear 

 union in, 145 ; duality of, 148 ; 

 in Protozoa, 149 ; origin of, 150- 

 153 ; theory of, 157-168 ; uses of, 

 163-167; a source of variation, 

 301 



Fish, sex differences in, 6, 30 ; 

 parental care of, 254, 255 ; ama- 

 tory emotions of, 265 



Flower, position of, 226 ; origin of, 



309- 

 Fluke, alternation of generations, 



204, 207 

 Follicular cells, 103 

 Free-martin, 37 

 Fungi, parthenogenesis in, 176 



