458 



INDEX 



Hydra, 



nervous system of, ectodemial, 70 



neuro-sensory cell of, 72 



nutrition of, 233 



quantitative research with, 203 



parasite of, 400 



peduncle of, 433 



permeability to inhibitors, 408 



physiological differences among, 371 



pigments of, 440 



proteases of, 241 



regeneration, chemical inhibition of, 

 399-412 



regeneration of, mitosis in, 315 



relative size of races, 368 



sexual differentiation of, 337-372 pas- 

 sim 



sodium requirement of, 204 



strain differences in, 402 



succinoxidase of homogenates of, 155 



tetramine of, 181 



tissue culture clone, analogy to, 359 



toxins of, 181 



see also Chloroliydra, H. Uttoralis, 

 Pelmatohijcha, and specific subjects 

 Hijdra littoialis. 



Strain I, 401 



Strain II, 402 



Strain III, 402 



Strain IV, 402 



see also Hydra 

 Hydra oligactis, 1, 402 



see also Pelmatohijdra, Hydra 

 Hydra pirardi, 



cnidoblast migration in, 438 



grafted to P. oligactis, 433 



grafting experiments with, 432 



a new species, 432 

 Hydractinia, 331, 356 

 Hydranth, Campanidaria, 



aging of, 303 



differentiation of, 297-316 passim 

 Hydrotheca, 299, 309 

 Hydroxyindoleamine, 



in H. Uttoralis, 164 



in H. oligactis, 163 



in coelenterates, 163 

 Hydroxyproline, 



changes in, during regeneration, 316 



in neniatocyst capsule, 148, 154 

 5-Hydroxytryptamine, 181 



in acontia, 180-184 



in Actii^ia equimi, 167 



action of, 186 



in Anemonia, 167 



in Calliactis parasitica, 167, 184 



5-Hydroxytryptamine, 



distribution of, 167, 180 



in nematocysts, 186 



of hydra, isolation of, 163 



in Metridium senile, 167 

 5-Hydroxytryptophan decarboxylase, of 



hydra, 164 

 Hypostome, 7, 24, 28 



cells of, arrangement, 34 



of Chloroliydra, 52 



gland cells of, 7 



histology of, general, 7 



inductive properties of, 427 



joins tentacle, 38 



Identification, of hydroid stocks, 372 

 Inclusion bodies, 8 



of gastroderm, 20, 54 



lipid, of gland cell, 20 

 Independent effector, 186 

 Induction, of hydranths, 



by bud tissue, 427 



of Cordylophora, 420 



by hypostome, 427 

 Inhibition, chemical, of regeneration, 



399, 407, 408 

 Inhibitor, of succinoxidase activity, 156- 



168 passim 



action of, on mouse and fiddler crab, 

 163 



degree of inhibition, 160 



destruction of, 160 



heat stability of, 166 



mechanism of action, 160 



on mitochondria, 166 



molecular weight of, 157 



pH stability of, 166 



protein nature of, 158 



proteases on, 160 



purification of, 157, 159 



site of action, 160 



on cytochrome oxidase, 162 

 on reduction of cytochrome, 162 

 on succinate-cytochrome-c reduc- 

 tase, 162 

 on succinic dedydrogenase, 161 



ultracentrifuge pattern of, 158 



ultraviolet spectrum of, 158 

 Inhibitors, 



of feeding reflex, 210 



permeability to, 408 



of regeneration, 399, 407, 408 

 Injection test, for growth factors, 236 



