INDEX 



233 



unicellular and multicellular or- 

 ganisms, 5 

 Continuity of germ-plasm, theory of, 



55 



between species, 73 

 between species, Poulton on, 73 

 between species, Darwin on, 74 

 between species, Rothschild and 



Jordan on, 74 



Convoluta, symbiotic with Alyce, 95 _ 

 Correns' experiments with Bryonia, 



199 

 experiments with Marvel of Peru 



( Mirabilis jalapa ) , 1 7 3-4 

 interpretation of determination of 



sex, 199-2Q1 



Cro-Magon, prehistoric human re- 

 mains at, 120 

 Crosses between various Salmonidce, 



117, 118 



Cytoplasm, function of, in heredity, 

 34 



Daphnia, supposed transmission of 

 acquired characters in, 137 



Darwin, Charles, on ancestral charac- 

 ters in pigeons, 114 

 on continuity between species, 74 

 on large and small variations, 62, 



72 

 theory of pangenesis, 7, 58 



Darwin, George, on age of earth, 100 



Darwin arid Wallace, theory of 

 evolution, 54 



Deformities, transmission of, 219 



Degeneration in favourable environ- 

 ment, 153 4, 163 

 in parasites, 153-4 



Dicthadia (African driver-ant), 150-1 



Differentiation in cells of multicellu- 

 lar organisms, 4, 6, 45, 68, 69 



Diappearance of characters, 66, 110 



Discontinuity between species, K. H. 

 Lock and Bateson, 73 



Disease, hereditary susceptibility to, 



218-9 



immunity to, 103-8, 147-8, 21f>-(;, 

 218-9 



Diseases, inherited, 136-7, 218-9 



Dixey, F. A., upon the mutation 

 hypothesis, 93 



Dogs, English, in India, 96 



Domesticated races, individual varia- 

 tions exaggerated in, 183-4 

 Mendelian characters generally 

 found in, 182 



Dominant characters, 168, 170 

 often imperfect, 176-7 



Dominants, impure, crossed with 



recessives, 172 



Dorylus (African driver-ant) 150-1 

 Driesch, experiments with enucleated 



ova, 36 

 Droscra, mode of catching insects, 87 



EGYPTIANS unchanged in appearance 



for thousands of years, 120 

 Elimination of useless variations, 126, 



130, 165 



Emboitement, theory of, 7 

 Embryos produced from portions of 



ovum, 10 



produced from unfertilised ova, 30 

 Empis, adaptations in, 80 

 Entomostraca, variations in, 60 

 Enucleated ova, experiments with, 



31, 35 



Environment, effect of, upon germ- 

 cells, 135, 136, 152 5, 162-4 

 upon inborn variations, 135, 136, 



157, 163-5 

 upon sex, 191-3 

 unhealthy, 154-5, 217 

 favourable, produces degeneration, 



153-4, 163 

 produces acquired characters, 134, 



136, 157, 163-5 

 Epiblast, 69 



Epilepsy in guinea pigs, 143-5 

 Evolution, theories of, 54-8 

 Exclusive inheritance, 180 

 Experiments with enucleated ova, 31, 



35 

 Eyes, inheritance of colour of, 180 



FABRE on instincts of f ossorial wasps, 

 145-8 



Feeble-minded, Royal Commission 

 upon, 154 



Fertilisation in multicellular organ- 

 isms, 27 

 in unicellular organisms, 2, 29 



Fertilised ovum, origin of, 4 



Fertility of hybrids, 75 

 not test of species, 74 



Fischer, experiments with Ctenophore 

 eggs, 36 



Fishes, adaptation in, 86 

 blind cave, 155 



Fluctuating variations, instability of, 

 65 



Foals with three toes, 115, 116 



Fowls, experiments upon secondary 



sexual characters of, 205-6 

 Mendelian characters in, 176 



Frequency of error, Gauss's law of, 99 



