INDEX 



Abraxas grossulariata, Mendelian ex- 

 periments with, 209-10 

 Accessory chromosomes as sex deter- 

 minants, 193-7 



Aculalia virgularia, breeding experi- 

 ments with, 186-7 

 Acquired characters 



Charles Mercier upon trans- 

 mission of, 155-9 



classification of, 53 



definition of, 46 



man's dependence upon, 52 



potentiality of producing is in- 

 born, 47 



pre-natal, 135 



produced by environment, 134, 

 136 



transmission of, in bacteria, 138 



transmission of, in Daphnia, 137 



transmission of, injurious, 152-4, 



163-4 

 Adaptation, 77-101 



in Avanthorhiza, 88 



in Antcnophorus, 80 



in Campanulas, Harvey Gibson 

 on gradual, 90 



in Drosera, 87 



in Empis, 80 



in fishes, 86 



gradual in the moth Amphidasys, 

 89 



in Holothurians, 86 



mutations incompatible with, 77, 

 91 



parasitic, 93 



in plants, 86-9, 90, 95-6 



produced by selection of inborn 

 variations, 158-9 



reasons for supposing always 

 gradual, 90 



in seeds of Scorpiurus, 88 



in Sitaris, 77 



in the Yucca, to moth (Pronuba), 



88 

 Age of the earth, 100 



231 



Alcoholism, effect of, upon germ- 

 cells, 135 

 AlyiK symbiotic with Comoluta, 95 



symbiotic with fungi (lichens), 95 

 Alpine plants, Niigeli's experiments 



with, 136 

 Alternative transmission of individual 



characters, 184, 189 

 Ammophila, transmission of instincts 



in, 145-8 

 Amphidasys, gradual adaptation in, 



89 

 Amphimixis as cause of variations, 



124 



chromosomes in, 124-8, 177-9 

 results of, 125 

 Ancestral characters, reversion to, 



113-118 



Antewrphorus, adaptation in, 80 

 Anthophora and its parasite Sitaris, 



78 



Ants, African driver, 150-1 

 honey, 151-2 

 slave-making, 81 



transmission of instincts in, 149-50 

 transmission of physical characters 



in, 150-2 

 Aphis, parthenogenetic reproduction 



in, 28 



Aster, definition of, 14 

 Atoxyl, effect of, upon trypanosomi- 



asis, 139, 142 



Aurelia, mutations in, not perpetu- 

 ated, 65 



BABOON inoculated with trypano- 

 somes, 140 



Bacot, see Prout 



Bacteria, supposed transmission of 

 acquired characters in, 138 



Bateson on discontinuity between 

 species, 73 



Bateson's interpretation of deter- 

 mination of sex, 200-1 



Bees, reproduction in, 28, 191 



