232 



Bees, social, transmission of instincts 



of, 149-50 

 Bi-parental reproduction, Archdall 



Reid on, 128 



chromosomes in, 23, 124-8, 177-9 

 effect of, 124-133, 165, 210 

 eliminates variations, 125, 129-30, 



133, 165 



universality of, 3 

 Bison crossed with European cattle, 



117 



Bleak hybrids, 118 

 Blended characters in half - bred 



sheep, 185 

 Blended inheritance, 179 



examples of, 117-8, 179, 185 

 Blending of characters in crosses 



between natural races, 117-9, 



173, 178-9, 185, 189 

 Bonnet, theory of emb6itment, 7 

 Boulenger, G. A., on mutations in 



(Enothera, 64, 71 

 Boveri, experiments with enucleated 



ova, 31, 36 



on function of cytoplasm in here- 

 dity, 37 



Brain of man and the apes, 161 

 Breamflat hybrids, 118 

 Brown-Sequard's experiments, 143-5 

 Bryonia, Correns's experiments with, 



199 

 Biitschli and Minot, comparison 



between unicellular and multi- 

 cellular organisms, 5 



CAMPANULAS, Harvey Gibson on 



gradual adaptation in, 90 

 Cancer. Resemblances to germ-cells 



(footnote), 57 



Castle's interpretation of determina- 

 tion of sex, 198-9, 201 

 Cattle, cross-breeding in, 185 

 Cell, definition of, 1 

 Cell division, 14-44 



(somatic), results of, 20 

 Cells, parts of, dividing in a selective 



manner, 40 

 structure of, 13 

 Centrosomes, definition of, 13 

 details regarding, 40 

 in unfertilised ova, 41 

 Ccrcopithecus callitrichus, inoculation 



of, with trypanosomes, 141 

 Characters, acquired, see Acquired 



characters 

 ancestral, Darwin on, in pigeons, 



114 

 ancestral, reversion to, 113-8 



Characters, blending of, in natural 

 races, 117-9, 173, 178-9, 185-7 



bulk of, inherited from remote 

 ancestors, 120, 121, 122 



classification of, 53 



disappearance of, 66, 110 



of domesticated races selected by 

 man, 133 



eliminated when not selected, 132 



inborn, see Inborn characters 



individual, fee Individual char- 

 acters 



Mendelian, see Mendelian char- 

 acters 



new, not produced by amphimixis 

 (bi-parental reproduction), 125 



physical, of prehistoric man, 120 



physical, transmission of, in ants, 

 i50-2 



prepotent, 179-80 



racial, see Racial characters 



represented by entities, 174-6 



theories explaining reappearance 



of ancestral, 114 

 Chondriosomes bearers of hereditary 



characters, 35 



Chromatin bearer of hereditary char- 

 acters, 33 



definition of, 13 



as hereditary substance, 18 



the idioplasm of Nageli, 18, 33 



not a permanent constituent of 



nucleus, 19 

 Chromatophores, 35 

 Chromosomes, accessory as sex deter- 

 minants, 193-7 



alternative distribution, 22-5, 41-4, 

 124-8, 177-9, 189 



combinations of, in fertilisation 

 (amphimixis, bi-parental repro- 

 duction), 23, 124 8, 177-9 



definition of, 15 



Mendelian characters contained 

 in, 177-8 



number of, 15 



number of in sterile crosses, 117 



paternal and maternal distinct, 32 



representing individual characters, 

 128, 189 



not representative of racial charac- 

 ters, 23 



splitting of, 16 



structure of, 19 

 Chubb, hybrids, 118 

 Cod-fish, capacity for multiplication, 



98 



Coloration, protective, 83 

 Comparison between life-cycle of 



