412 



THE BIOLOGY OF STENTOR 



Shedding 



of cilia, 240 



of membranellar band, 129, 

 249, 252 



of pellicle, 250 et seq. 



of pigment, 249, 250 et seq. 



of primordia, 173,253 

 Similarities in regeneration, reor- 

 ganization and division, 147, 

 152 

 Size 



decrease in starvation, 259 et 

 seq. 



of ectoplasmic units, constant, 

 121 



effect of temperature on, 257 



no gigantism, 17 



of mouthparts, 125 



racial differences, 320 

 Species of Stentor, 333 et seq. 

 (see names of species) 



tested by grafting, 335 

 Specific gravity, 6 

 Sphcerophrya stentoris, 273 

 Spiral growth, 66 

 Spirostomum, 42, 50, 118, 120, 



164, 238, 241, 242, 273, 287 

 Staining, 52, 348 

 Starch 



digestion, 266 



ingestion, 1 1 

 Starvation, 12, 259 et seq. 



in relation to symbiosis, 268 



utilization of reserves in, 262 

 Stenostomum, 47, 131 

 Stentor genus characterized, 333 

 Stentorin, 46 et seq. 



chemical nature of, 46, 48 



digestion of, 47 

 Stentorol, 47 

 Stentors as cells, 370 

 Stimulus to regeneration, 115 



transmitted, 137, 141 

 ** Stomatogenic kinety ", 160, 



161 



Stripe multiplication, 63, 64, 65, 

 66,91,139,163,164,165,169, 

 179 



in division, 68 

 Stripes, 6 



in doublets, 64 



interpenetration of, 229 



joining of, 227 



number of, 63 



in relation to division, 63 

 Structure, complexity of, 59, 60 



in relation to morphogenesis, 60 

 Stylonychia, 259, 267, 303 

 Surface precipitation reaction, 245 

 Survival 



of enucleates, 304 



not affected by micronuclei, 304 



on slides, 348 

 Swimming, \1 et seq. 



backward, 19 



of fragments, 1 9 



spiral, 1 7 

 Symbionts 



digestion of, 267, 269, 272 



exchange of, 271 

 Symbiosis with algae, 267 et seq.y 



315, 335, 336, 337 

 Synchronization of primordium 



development, 149 et seq. 

 Synchronous division, 346 



Techniques, 339 

 Temperature 



and feeding rate, 13 



effects on membranellar beating, 

 234 



effect on regeneration, 107, 117 



in relation to light response, 24 



other effects of, 244, 248, 257, 

 261, 263, 268, 293, 299, 344 

 Tetrahymena, 255 

 Theoretical considerations, 374 

 Time (period) 



for division, 74 



for regeneration, 117 et seq., 

 223 



