SUBJECT INDEX 



Nucleoli, movements in, 40 

 nucleoprotein of, 5 

 number of, 42-43 

 phosphatase in, 40 

 RNA in, 39-40, 79 



synthetic activity of, 14, 39-40, 47, 100 

 telophase changes in, 80 

 true, distinguished from heterochromatin, 



39 



vacuoles in, 40 

 Nucleoproteins, 5, 11, 197 



early histochemical attempts to distinguish 

 from nucleic acids, 3 



embryo extract, in, 1 78, 1 79 



nucleolus, in, 39 



nucleus, in, 16, 30, 32, 166 



peripheric, 92 

 Nucleosides, 6, 40 



mitotic effects, 186 

 Nucleotides, 12, 13, 106 



mitotic effects, 186, 189 

 Nucleus, vii, 30-65, 72, 74, 76, 112, 125 



affinity for dyes, i 



analysis of 



DNA, for, 33-38, 102-103 

 RNA, for, 33, 34, 103 



appearance of, by ultraviolet, 33 



decrease in size during cleavage. 38 



distribution of DNA in, 32-33 



enzymes of, 49-50 



Eeulgen reaction of 

 tissue cultures, in, 7 

 wheat embryos, in, 6 



growth of, 56-61 



isolation, methods of, 34, 50 



lipoids of, 50-51 



living and fixed compared, 31 



mitosis, and stimulus to, 166 



osmotic properties of, 53 



plant centrosomes, origin in, no 



proteins of, 47-50 



reconstruction of, 76, 79, 80 

 inhibited by hypertony, 81 



reticular texture of, 73, 78, 80 



RNA, origin in, 16 



rotation of, in prophase, 78, 79 



'thread-type', 64 



volume of, 81 

 Nurse cells, oi Drosophila ovary, 15 



endomitosis in, 62, 150 

 ■ somatic pairing in, 151 



Octoploidy, 55, 61 



Oenocanthus, centrioles of, 109 



Oestrogen, and growth of mammary glands, 



168 

 Oligonucleotides, in nucleoli of PMC's, 



16 

 Oocyte, nucleus of, 4, 13, 15, 39, 112 

 Amphibian, 41, 42, 98, 99 

 nuclear membrane of, 52 

 Echinus, in, 119 



nuclear sap of, 31, 119 

 insects, in, 39 

 Petromyzon, in, 40 

 snail, in, 32, 51 

 spiders, in, 40 



Opalinid ciliates, 'resting stage' in mitosis, 

 86 

 chromosomes without ash in, 105 

 'Optical emptiness', 31 

 Orientation 



cytoplasm, in, 147 



of chromosomes to achromatic figure, 78, 



112-115 

 Rabl, of chromosomes, 73, 77, 112 

 sub-microscopic 



achromatic figure, in, 1 19-123 

 centrioles, round, 123 

 centromeres, round, 123 

 Orthoptera, 71 



chromosome spirals in, 94, 95 

 spermatogenesis in, 44, 95 

 Ornithine, 50 

 Osmium tetroxide 



impregnation of lipoids, 21-22 

 vapour used in isolating salivary chromo- 

 somes, 97 

 Osmunda, chromosome spirals in, 94 

 Osteoblasts, 20 



Ovarian nurse cells, 15, 62, 150, 151 



Oxygen uptake, in marine eggs, 144 



rate of, during cleavage, 1 39, 200 



P" uptake, 16, Plate IV 



DNA synthesis, in, 



dinitrophenol, reduced by, 199 

 usnic acid, reduced by, 200 

 Pachytene, loi, 102, 104, 109, in, 112 

 Pancreas, preparation of nucleoclastic 



enzymes from, 8 

 Paracentrotus, egg of 



nuclear division under pressure, in, 138 



nuclear DNA in, 35, 102 



permeability changes in, 135 



Qio of mitosis in, 87 



synthesis of DNA after telophase, in, 102 

 Paradichlorobenzene, effect on plant cyto- 

 kinesis, 198 

 Paraffin, liquid 



living cells mounted in, 71, 72 



oxygen soluble in, 71 

 Paramoecium, respiration of, 189 

 Parechinus, effect of displacing nucleus, 39 

 Paris, negative heterochromatin in, 44 

 Parthenogenesis, 54 

 Particles 



long-chain, evidence for in cytoplasm, 25 



macromolecular, isolated from cytoplasm, 

 24, 178-181 

 effect of heparin on, 194 

 enzymatic activities of, 180 

 Pedicidopsis, spermatocytes of, 122 

 Pentaploidy, 55 



Pentatomidae, bouquet stage in, 112 

 Pentose, 5 



nucleic acid, 6, 7 

 Pepsin, 103-104 



Peptide bonds, synthesis of, 16-17 

 Peptides, 172, 173 



large, as mitotic stimulants, 173 

 Peptone, Witte, 171, 172 

 Perchloric acid, dissolves RNA, ig 

 Peripateticks, 17 



228 



