location, 26 

 structure, 27-29 



Nucleus, 75 et seq. 



boundary of, 75-81, 139 



chemistry of, 103 et seq. 



general structure, 75 

 NuIIosomic, 179 



Oenothera Lamarkiana, 186 

 Osmium tetroxide, 63, 213 

 Oxidation, 33-35 



Palade, small granules of, 49, 54, 55 



Paramecium, 66, 75 



Paris, 91 



PAS reaction, 220 



Peptide linkage, 14 



Plileiim protense, 177 



Phosphorylation, 33, 35, 43 



Photometry, 221-222, 237 



Photosynthesis, 43 



Pisiim, 67. 121, 132, 143 



Plastids, 38-46 



amyloplasts, 41 



chloroplasts, 38, 40-46 

 function of, 43-45 



eliaoplasts, 41 



fine structure, 40-42 



reproduction of, 44 

 Podophvliiim, 128, 134 

 Polyploidy, 174-179 



alio-, 175-176 



auto-, 175-176 



in animals, 178 



in plants, 177 

 Polysaccharides, 22 

 Polysomaty, 179, 272 

 Polyteny, 132, 180-181 

 Protein, 12, 14, 15 



chemistry, 14, 15 



in chromosomes, 109 



in cytoplasm, 59, 211-212 



synthesis, 55-59, 270 

 Protoplasm, 1, 12 

 Puffing, 97, 190 

 Pyruvate, 33, 36 



Radiation, 192 et seq. 

 biochemical theory, 194 

 effects of, 194-197 

 chromosomal, 195 

 hazards. 199 

 modification of, 197 

 mutational, 195 

 physiological, 194 



target theory, 194 



types, 192 

 Refractometry, immersion, 231 

 Rhoeo discolor, 186, 187 

 Ribosomes, 49, 55 



Ribose nucleic acid (RNA), 16-18, 55- 

 59, 108-109, 237 



chemistry, 16-18 



distribution, 55-57, 108 



Sakaguchi reaction, 219 



Sea urchin, 145 



Sex chromatin. 272 



Sex determination, 189-190 



Solamim nigrum, 111 



Somatic reduction (see Variations in 



mitosis) 

 Spectrophotometer, 241 

 Spinacia oleracea, 82, 190 

 Spindle, 123, 140-152 



biochemistry of, 146-150 



structure, 141-143, 151 

 Spirogyra, 205, 206 



Split figures (see Variations in mitosis) 

 Staining, 215 et seq. 



cytochemical, 218-222 

 Sulfhydryl group, 146-150, 219 

 Synapsis, 126, 152 



Taxonomy, 273 



Tetrazolium, 220 



Thymine, 17-19 



Tracers, radioactive, 257, 259 



Tradescantia, 67, 82, 177 



Translocation, 185-188 



Trillium, 87, 91-93, 132, 153, 166, 167, 



197, 198, 199, 200 

 Triphosphopyridine nucleotide, 33-35 

 Trisaccharides, 22 

 Triticum vulgare, 111 

 Tri turns, 91, 102 



Ultraviolet, 192 

 Uracil, 17-19 



Vacuole, 67 



Vicia faha, 106, 139 



Virus, 18, 203 



Water, 13 



bound, 13 



free, 13 

 Whitefish, 122 



X-chromosome, 189-190 



Y-chromosome, 189-190 



Yeasts, 204 



Zwitterion, 15, 218 



SUBJECT INDEX / 297 



