INDEX 



213 



of Tubular ia, 97; in short pieces 

 of Planaria, 99; in long pieces 

 of Tubularia, 132; in plants, 

 152; in relation to shape of 

 piece in Planaria, 1 14. See also 

 Reconstitution; Reproduction, 

 agamic, gametic. 



Reproduction, gametic: occur- 

 rence of, 13; nature of, 47, 198; 

 difference between, and agamic, 

 200. See also Reproduction, 

 agamic, experimental. 



Roots of plants: as subordinate in- 

 dividuals, 104, 162; dominance 

 and physiological isolation in, 

 157; relation of, to other parts 

 of plant, 159; conditions deter- 

 mining formation of, 162. 



Sea-urchin, control of proportions 

 in larva of, 58. 



Senescence: nature of, 46, 90; in 

 relation to self-maintenance of 

 parts, 177; in relation to game- 

 tic reproduction, 198; in rela- 

 tion to evolution, 205. See also 

 Rejuvenescence. 



Starfish: axial relations in, 8; sus- 

 ceptibility gradient in egg of, 56. 



Stenostomum: agamic reproduc- 

 tion in, 79; extension of domi- 

 nance in, 150. 



Stentor, susceptibility gradient in, 

 55- 



Subordination, physiological: ori- 

 gin of, 36; of basal to apical 

 levels in Planaria, 102, 115; of 

 basal to apical levels in plants, 

 104. See also Dominance. 



Susceptibility: in relation to me- 

 tabolism, 51; gradients of, 52; 

 gradient of, in Stentor, 55; gra- 



dient of, in starfish egg, 56; 

 gradient of, in plants, 61. 

 Symmetry: occurrence of, 8; of 

 starfish, 8; susceptibility gradi- 

 ents in axes of, 57; bilateral, in 

 certain plants, 77,86; in "rings" 

 in Harenactis, 148; in conifers, 

 155; origin of, 181; significance 

 of experimental alterations of, 

 182; conditions determining, 

 199. See also Axis; Gradients; 

 Polarity. 



Teratomorphic form, in Planaria, 

 106, 141. 



Teratophthalmic form, in Pla- 

 naria, 106, 141. 



Transmission: decrement in, 29, 

 32, 45, 47, 150, 172, 173; nature 

 of, 31, 44, 177; in relation to 

 conductivity, 40; possibility of 

 different kinds of, 43, 178; range 

 of, 45 ; increase in range of, dur- 

 ing development, 149; in rela- 

 tion to dominance, 170. See 

 also Conductivity. 



Transportation: occurrence of, in 

 organisms, 4, 27; conditions de- 

 termining, 26, 170, 172; from 

 roots of plants, 161. See also 

 Correlation. 



Tubularia: description of, 91; 

 agamic reproduction in, 92; 

 experimental reproduction in 

 short pieces of, 97, *33; domi- 

 nance in experimental reproduc- 

 tion of, 102; control of distance 

 relations in reconstitution of, 

 128; reconstitution of hydranth 

 of, 128; reconstitution in long 

 pieces of, 132; range of domi- 

 nance in, 133; inhibition in re- 

 constitution of, 135. 



