Index. 



333 



Male cell, discovery of, 21 

 Male more variable than fe- 

 male, 160 

 Male fish originally varied, 



198 



Male more modified than fe- 

 male, 170 



Manx cat, hybrid from, 128 

 Many individuals must vary 



together, 155, 277 

 Mammals, sexual differences in, 



204 



Man, sexual differences in, 204 

 Manchamp merino sheep, 299 

 McCrady on polar cells, 70 

 Medusae, parallel variation in, 



303 



Mice, hybrid, 131 

 Mill on subjection of women, 

 .264 



Mirabilis, variation in, 120, 121 

 Mivart on homology, 310 



' ' on requisites of a theory 



of heredity, 86 

 " on saltatory evolution, 



83, 297 

 on sudden variation of 



plants, 301 



" on time needed for evo- 

 lution, 284 

 Molliensia, 197 

 Moquin-Tandon on variation of 



plants, 94 



Moths, parthenogenesis in, 59 

 Mule, 127, 134 



Mtlller on dimorphism in crus- 

 tacea, 188 



Natural selection, 12, 14, 275 

 Narwhal, 205 



Nervous system, development 

 of, 23 



Neuroterus, 63 



Niata cattle, hybrids from, 130 



North British Review, argu- 

 ment against natural selec- 

 tion, 277 



Notedelphys, 177 



Oelacher on parthenogenesis, 67 



Onitis, 193 



Orange, bud-variation in, 147 



Orchestia, 187 



Origin of sex, 314, 316 



" of complicated organs, 



281 . 



Ornithorinchus, 205 

 Ostracoda, 175 

 Ovist, 22 



Ovum, complexity of, 87 

 " development of, 23 

 " function of, 84 

 " homologous with other 



cells, 23 



properties of, 8, 81 

 structure of, 22 

 Ovum and male cell, difference 



in function of, 53, 74 

 Ovum and male cell, homolo- 

 gous, 17 



Pander, 22 



Pangenesis hypothesis, Dar- 

 win's, 50, 121, 124 



Pangenesis hypothesis, Galten's 

 objection to, 53 



Pffngenesis hypothesis, objec- 

 tions to, 53 



Pangenesis hypothesis, re- 

 modelled, 80 



