212 



INDIVIDUALITY IN ORGANISMS 



formative influence of, 119, 176; 

 self-determination of, in devel- 

 opment, 1 20, 1 88; extension of 

 dominance in, 151; dominant 

 region of, 175; functional domi- 

 nance of, 176; possible nature of 

 inhibition in, 180; in relation to 

 fundamental reaction system, 

 1 88; animal organism in rela- 

 tion to, 189; possibility of de- 

 differentiation in, 191. See also 

 Conductivity; Transmission. 



Organization: theories of, 22; as 

 a condition of chemical correla- 

 tion, 26; not the basis of organic 

 individuality, 41; in relation to 

 minimal size in reconstitution, 

 124; in relation to experimental 

 conditions, 184. 



Parthenogenesis, 199, 200. 



Pennaria, developmental gradients 

 in agamic reproduction of, 79. 



Planaria dorotocephala: suscepti- 

 bility gradients in, 52; develop- 

 mental gradients in experimental 

 reproduction of, 81; agamic re- 

 production of, 92; experimental 

 reproduction in short pieces of, 

 99; dominance and subordina- 

 tion in, 102; reconstitution in, 

 105; different forms of head in, 

 1 06; head-frequency in experi- 

 mental reproduction of, 1 08; ex- 

 perimental control of head- 

 frequency in, 108; control of 

 range of dominance in, 138; de- 

 termination of biaxial forms in, 

 149; extension of dominance in, 

 149; localization as resultant of 

 different axes in, 164. 



Planaria maculata, head-frequency 

 in reconstitution of, 113. 



Polarity: occurrence of, 8; theo- 

 ries of, 28; obliteration of, in 

 experimental reproduction, 100; 

 origin of, 181; nature of, 182. 

 See also Axis; Dominance; 

 Gradients; Individual. 



Poplar, development of buds on 

 callus in, 86. 



Protoplasm : in relation to metabo- 

 lism, 16; as a metabolic pro- 

 duct, 1 7 ; metabolic gradients in , 

 34; differentiation of, in rela- 

 tion to metabolic gradients, 171 ; 

 effect of quantitative external 

 factors on, 186. 



Reconstitution: in relation to 

 metabolic gradients in Planaria, 

 81; independence of apical re- 

 gion in, 97; dominance and sub- 

 ordination in, 102; the process 

 of, in Planaria, 105; limiting 

 factors in, 117; progressive limi- 

 tation of, in animals, 120; in 

 embryonic stages, 121; propor- 

 tional relations of parts in, 122; 

 limit of size in, 1 24; of hydranth 

 in Tubular ia, 128; in long pieces 

 of Tubularia, 132; of "rings" in 

 Harenactis, 146. See also Indi- 

 vidual. 



Rejuvenescence: nature of, 46, 90; 

 in reconstitution of Planaria, 89; 

 in posterior zooids of Planaria, 

 94; capacity for, in lower and 

 higher animals, 1 20; in relation 

 to physiological isolation, 193; 

 in early embryonic develop- 

 ment, 199. See also Senescence. 



Reproduction, agamic: occurrence 

 of, 12, 89; of parts, 13, 195; in 

 relation to physiological isola- 

 tion, 45, 192; in Pennaria, 79; 

 in Stenostomum, 79; in Metz- 

 geria, 83; of adventitious buds 

 in Begonia, 83; in Tubularia, 

 92; in Planaria, 92; different 

 conditions determining, 193; 

 localization of, 196; difference 

 between and gametic, 198. See 

 also Isolation; Reproduction, 

 gametic. 



Reproduction, experimental: sig- 

 nificance of, 14, 88; in Planaria, 

 81, 105; in poplar, 86; in Mar- 

 chantia, 86, 165; in short pieces 



