SUBJECT INDEX 



Mitotic gelation prevented by, 



polysaccharides, 194 

 tissue extracts, 194 

 index, 89, 153 

 poisons, 183-200 

 Monasters, adventitious, 107 

 Monkey, egg of, centrosomes in, 107 

 Monocentric division in Sciara, 117, 118 

 Monocytes, 170 



Mosquito, larval, nuclear size in ileum of, 61 

 Mouse 



castrated, hormones in, 169 

 chromosomes of 

 embryos, in, 62 

 tumours, in, 63, Plate III 

 embryos of, P-' uptake in, 16 

 interphase 



nuclei of, 56-59, 88 



DNA in, 37, 38, 63, 102 

 nucleoli of, 42-43 

 leucaemia in, 64 

 mitosis in 



cultivated spleen, 78-80, 85, 93, Plates, 



II, VIII-XII 

 ear lobe, 84, 85, 187 

 periodicity in, 91 

 spermatocytes, 50 

 Movements 



cytoplasmic, 22, 23 

 during mitosis 



animals, in, 137, 141 

 plants, in, 146, 147 

 Mucosal cells, phosphatases in, 17 

 Muscle, smooth, 105 



contraction compared with spindle fibres, 

 127 

 Mustard gas 



action on dividing cells, 184, 191, 197 

 mutagenic effect of, 184 

 Mutagenic chemicals, effect on heterochro- 



matin, 45 

 Myelin figures, formation by ethanol, 



relation to Golgi body, 21-22 

 Myosin, 24 

 Aiyxine, slime glands, 39 



I, 4 naphthohydroquinone diphosphate as 



mitotic inhibitor, 191 

 Naphthyl acetic acid, 166 

 Narcotics 



fundamental action of, 194-195 



general effects and mitotic inhibition 

 compared, 194 

 Necturus, amitosis in erythrocytes, 152 

 Nematodes, eggs of 



cortical movements in, during cleavage, 1 4 1 



resistant nature of, 141 

 Nereis, egg of, metaphase inhibition, 199 

 Neuroblast oi Chortophaga embryo, 137 



interphase in, 88, 89 



mitosis in, 76-77, 137, 191 

 Neurone, protein synthesis in, 13 

 Neutral red, 135 

 Newt, 77 



heteropycnosis in, 44 

 Nicotiana, cells of flower bud, viscosity 

 changes in mitosis, 137 



Niss! substance, digestion of, 4 



Nitrogen mustards, 190 



a-nitronaphthalene as mitotic inhibitor, 192 



Nitroprusside reaction, 195 



Nucleal reaction, see Feulgen reaction 



Nuclear areas and heteroploidy, 54, 55 



Nuclear membrane, 30, 51-53, 75-80, 98, 

 III, 114, 118, 148, 150, 190 

 birefringence, 52 



chromonemata line inner surface, 31, 79 

 dissolution of, in or after prophase, 51, 52, 



73, 74> 79, 125, 133 

 formation of, in telophase, 32, 80 

 isoelectric point of, 52, 1 18 

 not an artefact, 51 

 passage of nucleoli through, 43 

 permeability, 53 



zone of high ultraviolet absorption 

 surrounding, 14 

 Nuclear sap, 77, 78, 100, 119 

 contributes to spindle, 125 

 fluid, a, 30, 31 



no DNA in that of Amphibian oocyte, 33 

 Nucleases, 8-1 1, 196, 197 

 cytochemical use of, 9-10 

 history of, 3 

 Nuclei, isolated, i 

 analysis of 



DNA, for, 34, 37 

 RNA, for, 34 

 methods of preparation, 34, 49, 50 

 Nucleic acids, 1-17, 55, 105, 134 

 birefringence of, 97 

 counteract effect of trypaflavine on 



cultures, 196 

 deoxypentose, 48, 63, 100-103, 106, see 

 also thymonucleic acid 

 analysis of nuclei for, 33-38 

 localization of, 6-7 

 state of, in interphase nucleus, 33 

 history of, 1-8 



pentose, 50, 103, 106, 180, 181, see also 

 tricitonucleic acid 

 dissolved by acids, 10 

 interphase nuclei, in, 33-34 

 synthesis of, 14-16 

 protein synthesis, and, 13-17 

 'Nuclein', 1-3 



resists peptic digestion, 2 

 Nucleolar organisers, 41-43 

 Nucleoli, vii, i, 4, 30, 31, 33, 38-43, 72, 73, 

 75, 76, 80, 98, 119 

 absorption spectra, 46 

 acidophiiia of, 39, 45 

 Amphibian embryos, in, 15, 16 

 area of, and heteroploidy, 42 

 basophilia, 39, 103 



cytoplasmic, 15 

 chromosomes, relations to, 41-43, 100 

 coacervates, as, 41 

 dissolution of, 41 



in or after prophase, 52, 73, 74, 78, 79, 

 84 

 extrusions into cytoplasm from, 39-40 

 fragmentation of, 41 



history of, 38-39 

 lipoids in, 50, 51 



227 



