INDEX 



213 



pieces _ of Tubnlaria, 97; in 

 short pieces of P/awana, gg; in 

 long pieces of Tubnlaria, 132; 

 in plants, 152; in relation to 

 shape of piece in Planaria, 114. 

 See also Reconstitution; Repro- 

 duction, agarnic, gametic 



Reproduction, gametic: occur- 

 rence of, 13; nature of, 47, igS; 

 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, i5g; conditions deter- 

 mining formation of, 162 



Sea-urchin, control of proportions 

 in larva of, 58 



Senescence: nature of, 46, go; in 

 relation to self-maintenance of 

 parts, 177; in relation to ga- 

 metic reproduction, igS; in re- 

 lation to evolution, 205. Sec also 

 Rejuvenescence 



Starfish: axial relations in, 8; sus- 

 ceptibilit}' gradient in egg of, 56 



Stenosiomum: agamic reproduc- 

 tion in, 7g; 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, 6i 



Symmetry: occurrence of, 8; of 

 starfish, 8; suscei)iibi!itv grnrii- 

 ents in axes of, 57; bihiteral in 

 certain plants, 77, 86; in "rings" 

 m Ilarenactis, 148; in conifers. 

 '^SS\ origin of, 181; significance 

 of experimental alterations of, 

 182; conditions determining, 

 igg. See also kias; 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 

 differentkindsof, 43, 178; range 

 of, 45; increase in range of, dur- 

 ing development, i4g; 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 



Tubnlaria: description of, 91; 

 agamic reproduction in, 92; 

 experimental reproduction ii. 

 short pieces of, 97, 133; domi- 

 nance in experimental reproduc 

 tion of, 102; control of distance 

 relations in reconstitution ot. 

 128; reconstitution of hydranlh 

 of, 128; reconstitution in long 

 pieces of, 132; range of donii 

 nance in, 133; inhibition in re- 

 constitution of, 135 



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