INDEX. 



401 



Plant-breeding, references for, 



105 



Plants, amelioration of, refer- 

 ences for, 105 



Plate, L., admission of the need 

 of acquired characters to aid 

 selection, 170, 178; answer to 

 the claimed improbability of 

 timely appearance of varia- 

 tions needed in co-adaptive 

 structures, 176; answer to the 

 objection concerning the de- 

 pendence of selection on 

 chance, 170; answer to the ob- 

 jection to selection based on the 

 slightness of Darwinian varia- 

 tions, 165; claim that correla- 

 tion may aid slight variation, 

 167; claim that same selective 

 value may be obtained in dif- 

 fe"rent ways, 172; claim that 

 selection works with plural 

 variation, 172; classification of 

 secondary sexual characters 

 by, 107; conciliatory defence 

 of Darwinism, 164; criticism 

 of mutations theory, 368; 

 criticism of organic selection, 

 210; criticism of Roux's 

 theory of intra-selection, 203; 

 discussion of Lamarckism, 

 273; disbelief in Weismann's 

 principle of germinal selection, 

 180 ; explanation of character 

 fixity in domestic animals, 163 ; 

 explanation of the case of 

 Kallima, 175 ; Lamarckian ex- 

 planation of degeneration, 

 147 ; recognition of the weight 

 of certain objections to Dar- 

 winism, 181 ; resume of facts 

 tending to prove orthogene- 

 sis, 279 ; reviewer of criticisms 

 of Darwinism, 30 



Podocoryne and hermit crab, 

 symbiosis of, 23 



Polyp and hermit crab, symbiosis 

 of 23 



Promethea, Mayer's experiments 

 on, 121 



Protoplasm, micromeric theo- 

 ries of structure of, 215; 

 physical and chemical struct- 

 ure of, 194; theories of ulti- 

 mate structure of, 214; Weis- 



mann's theory of the ultimate 

 structure of, 195 



Quetelet, discoverer of variation 

 according to the law of chance, 

 61 



Redfield, C, favouring Lamarck- 

 ism, 305 



Regression, Galton's law of, 71 ; 

 statement of Galton's law of, 

 07 



Romanes, G. J., discussion of 

 Gulick's work and conclusions, 

 250 ; on physiological selection, 



245 



Rosa, D., theory of progressive 

 reduction of variability, 322 



Roux, W., theory of intra- 

 selection or battle of the parts, 



201 



Secondary sexual characters, 

 Cunningham's explanation of, 

 354; Emery's theory of the 

 origin of, 353 ; references to 

 exposition of theories, 373 ; 

 Wallace's suggested explana- 

 tion of, 354 



Seebohm's criticism of physio- 

 logic selection, 247 



Selection, artificial, defined, 15; 

 artificial, natural selection 

 resting too largely on an anal- 

 ogy with, 86 ; based on varia- 

 tion, 30; cannot explain com- 

 plete degeneration, 77 ; co- 

 efficient, Wolff's discussion of, 

 101 ; Darwin's theory of sex- 

 ual, in; Delage's estimate of, 

 390; de Vries's discussion of 

 species-forming by, 389; de 

 Vries's estimate of, , 93 ; diffi- 

 culty of explainin^-^complex 

 relations among body-parts by, 

 51 ; difficulty of explaining 

 inter-species sterility by, 76; 

 difficulty of explaining repeated 

 identical structures by, 47 ; ex- 

 ample of persistence of trivial 

 differences in face of, 103; 

 example of progressive degen- 

 eration, not expjicable by, 100; 

 final arbiter in descent* 374; 

 geologic time too short to 



