460 Subject Index 



Neuroblasts of grasshopper (coiitiitucd) 



photomicrographs of, 66 



ribo-micieic acid, 89 



specific concentrations, 41, 70 



spindle inhibition, 68 



in study of prophase, 32-33 



successi\e changes in, 70 



technicjue developed with, 71-73 



viscosity changes, 89 



in vitro technique, 377 

 Neuromuscular apparatus, 179 

 Neuromuscular block, ISO 

 Neutrons, 2()9 

 Nicotiana, 254, 288, 346, 347, 357. 362 



back-cross segregates. 308 



species of: digluta, 307; i^littiuosa. 359: 

 langsdnrfjii. 356: sauderaea, 356; 

 tabacuni, 309; tahacuni var. virii, 

 307 



svnthesis of A', digluta. 309 



svnthetic tobacco species, 309 



trisomies and corolla size, 356 

 Nicotinamide, 397 

 Nipple. 226 



Nitella mucronata, 119 

 Nitro-derivatives, 400 

 Normal interphase. 380 

 North Clarolina State College. 331 

 Northern hemisphere, 141, 323 

 Norway, 322 

 Nostoc commune, 1 19 

 Nuclear sap, 202 

 Nucleic acid, 221 

 Nucleoli, in neurol^lasts, 70-71 

 Nucleoprotein metabolism, 197 

 Nullisomics, 357-58 



Number of fruits, triploid, increase, 367 

 Number of mitoses, 378 

 Nuptial colors in Rhodcus, 191 

 Nuts, 279 



Oats, 26, 279 



Octoploids, 95; see also Aneuploitly, 

 AiUoploidy, Polyploidy 



la\ers in shoot apex, 356 

 Oedognnium. 1 19 



pohploidv in, 124 

 Oenothera lainarckiana \ar. niiias, 318 

 Official status of drug, 140 

 Oil-bearing seeds, 326 



Brassica. 326 



flax. 326 



sesame. 326 

 Oiomouc, Czechosknakia. 143, 149 



fruit development of Colcliinan. 149 

 Omphalomesenteric vessels, 209 

 Opatjue hvaline golbulc, 80 

 Organoleptic tests of drugs, 1 II 

 Oriental medicine and ih iig ])lants, 6 



Orthoptera, 41 



Gy rill is assiniilis. 90 



Melanoplus diljerentiiilis. 77, 90 

 Oryzias latipes, 204 

 Oryza sativa var. indica x ^^^- japonica 



autotetraploid and diploid hybrid fer- 

 tilitv, 321 



hybridization, 320 

 Ovalbimiine, 197 

 Ovariectomy, 232 

 Ovary 



corpus luteum, 230 



follicular cells, 220 



of frog, 1 92 



germinal epitheliiun. 219 

 Ovipositor, 191. 226 

 Oxaloacetic acid, 166 

 Oxycolchicine, 169; see also Oxydi- 



colchicine 

 Oxydicolchicine, 180, 195 

 Oxvgen, 223, 224 

 Oxxtricha. 126 



Pairing characteristics, 385 

 Pairing of chromosomes, 1 13 



for classif\ ing polvploids, 283 



intergenomal pairing, 293 



measure of homologx, 281 



quadrivalents, 364 

 Paleolagus, 12 

 Pallavacinia spp., 118, 119 

 Pancreas, exocrine, 193, 210, 230 



Langerhans, islets of, 177, 226, 227, 

 230. 236. 241 



late mitoses in. 193 

 Pancreatic glantl, 177 

 Papilloma 



Shope, in rabbits, 262, 263 



\enereal, in man, 263 

 Paracentrotus. egg, 203, 401 

 Paramecium 



effect of temperature, 374 



species of: caiidaliim. 126; niultiiiii- 

 croniicleatum . 126 



in vitro, 374 

 Parathryoid, 226, 227, 229, 230, 234. 240 

 Partial inacti\ation spindle, 69 

 Pasture species. 321 

 Patulin, 415 

 Paul of Aeginata, 12 

 Pelargonium, tiunors in, 266 

 Peltatin, 261, 413 

 a-Peltatin. 413 

 /3-Peltatin, 413 

 Pelvis; see Kidney 

 Penicillium notatum. 123 

 Pentaploids. .354, 382 



source of ancuploids, 354 

 Pepagomeus, 12 



