SUBJECT INDEX 



409 



Oral inhibition of primordium 

 formation, 119, 144 et seq., 

 200 

 in mincerates, 223 

 Oral pouch, 7, 16, 29, 172, 173, 

 178, 186 

 closure of, 14 

 contraction of, 31 

 Oral valency 

 defined, 206 

 in mincerates, 224 

 reduction of, 208, 213 et seq. 

 Organelles 



(see maintenance of organelles) 

 adjustment of multiple, 211, 



213 

 migration of; 211 

 Osmiophilic bodies, 57 

 Osmotic eflfects, 239, 244 

 Over-pigmented stentors, 275 

 Oxidation in membranellar band, 



247 

 Oxidation-reduction studies, 265 

 Oxytrichia, 285 



Paramecium, 19, 20, 22, 40, 41, 

 48, 206, 259, 266, 267, 268, 

 269, 271, 272, 280, 324, 366, 

 368, 375 

 Parasites of stentors, 273 et seq. 

 Pattern 



cortical, 366, 373, 376 



disarrangements of, 226 et seq. 



importance of, 148, 377 et seq. 

 Pellicle, 6, 42 



regeneration of, 252 



shedding of, 250 et seq. 

 Peristome, 7 



(see membranellar band) 

 Persistence of division, 84 et seq. 

 pH 



of cytoplasm, 246 



effects of, 246 



of food vacuoles, 302 



of macronucleus, 246 



of medium, 346 

 Phosphatase, acid, 266 



Phylogeny, recapitulation of, 73, 



164, 176, 281 

 Pigment 



of coeruleus, see stentorin 



depigmentation in chimeras, 

 315, 317 



digestion of, 17, 49 



fading of, 260 



fluorescent, 48 



of niger, see stentorol 



regeneration of, 250, 252, 275 



shedding, 249, 250 et seq. 



types of, 46 

 Pigment granules, 43, 250 



abnormalities, of, 274 et seq. 



attempt to remove, 252 



biochemistry of, 45 



their displacement, 43, 44 



as fill-ins, 44, 169 



in metabolism, 260, 274 



as mitochondria, 45 



as nutritive store, 44, 107 



origin of, 46 



regeneration of, 252 



shifts of at fission line, 76 



transfer between grafted cells, 46 

 Pigment (granular) stripes, 43 



as fill-ins, 44, 169 

 Pigmentation, degree of 



depigmented stentors, 274 



as indicating physiological state, 

 46 



over-pigmented stentors, 275 

 Pinocytosis, 36 

 Pipette 



polyethylene, 341 



Spemann, 349 

 Plasma membrane, 43 

 Polarity, 195 et seq. 



(see also heteropolarity) 



adaptive shifts in heteropolar 



- parts, 196 



in bistomatous primordia, 175 



cancellation of, 175 



conflicts, 215, 227 



fixity of, 195 



in fragments, 196 



