SUBJECT INDEX 



Pseudopodia, 133 



Psophus, spermatocytes of, filmed in meiosis, 



Purines 



effects of, on dividing cells, 186, 190 

 first termed 'alloxuric bases', 2 

 resonance frequency of ring structure, 1 1 



Pus, I 



Pycnotic nuclei, loi 



Pyrimidines 



recognition in nucleic acids, 5 

 resonance frequency of ring structure, 1 1 



Pyronin, 9, 13, 103 



Pjrrochoris, peculiar chromatin element in 

 spermatocytes, 43 



QiQ values, of mitotic phases, 86-88 

 Quercitin, 192 



Rabbit, Plate VIII 



egg of, cleavage in, 89 



skin of, in culture, 188 

 Radiation, 135, 165, 175 

 Radiomimetic substances, 183, 196 

 Random metaphase movements, 117, 126 



inhibition of, never followed by anaphase, 



191 

 Rat, 34, 37, 62 



liver of, 58, 59, 61, 64 



mitosis in, 102 

 duration of, 86 



nuclei vesicular, 32 



nucleolar number in, 42 

 Ratio 



karyoplasmic, 53 



surface-volume, of growing cells, 165 

 Rays, astral, 75, 92 

 Razor, of Occam, 118 

 Recoil, elastic, 27 



Reconstruction of telophase nucleus, 74, 76, 

 78-80, 186, 191 



inhibition by hypertony, 81 

 'Reduction' divisions, in Culex ileum at 



metamorphosis, 151 

 Refractive index 



phase microscope and, 31, 120 



whole egg, of, 140, 141 

 Renosin, 24 



Resonance frequency, 1 1 

 Retardation curves, of living spindle, 120 

 Rhizoids, 74 



Rhythmic growth, of nucleus, 56, 60, 152 

 Rhythms 



mitotic, 83-84, 90-91 



respiratory, in cleaving eggs, 189 

 d-ribofuranose, 5 

 Ribonuclease, 8-1 1 



cytochemical use of, 9 



nucleoli, effect on, 39 



prepared free of proteolytic activity, 10 



stability of, 8 

 Romalea, anaphase chromosomes of, 93 

 Rotation of prophase nucleus, 78-79 

 Rounding of cell in mitosis, 133 



Sabellaria, egg of, 87 



DNA content unequal to that of sperm, 35 



Sabellaria, egg of, surface bubbles at matura- 

 tion division, 144 



Saccharose, living cells mounted in, 72, 73, 

 see also sucrose 



Salix, effect of temperature on nucleoli in, 41 



Salivary chromosomes of Diptera, 46, 61, 92, 



96-99 



chromocentre of, 45, 46 



digestion of, 103 



elasticity of, 97, 106 



endomitosis in, 96, 151 



Feulgen-positive bands, 17 



growth of, 96 



insensitive to pressure, 138 



micro-incineration of, 105 



nucleoli of, 42 



orientation within, 98 



structure of, 96 



technique of isolation, 97 

 Salmon, Rhine, 2, 47 

 Sampling errors, 57 

 Sarcoma, rat, nuclear size in, 59 

 SAT thread, 47 

 Schiff's base, 5, 6 

 Sciara, 117, 118 



giant chromosomes of, 96 

 Secretory cells, nuclei of, 32, 64 

 Serine, 49 

 Serum 



globulin 



absorption spectrum of, 12 

 produced by leucocytes, 172 



horse, 169, 171 

 Sex chromosomes 



heteropycnosis of, 43 



human, 42 



silkworms, 42 

 Silk glands, of Arachnida 



nucleic acids in, 13 



nucleoli in, 40 

 Size classes of interphase nuclei, 37, 57 

 Slime-moulds, 25 

 Snail, oocyte of, 32, 51 

 Sodium 



arsenite, 195 



cacodylate, 195 



chloride, 2, 48 



oleate, 27 

 Sol-gel equilibria 



effect of hydrostatic pressure on, 138 



volume change in, 138 

 Somatic pairing, 151 

 Sperm 



bull, of, 34 



Echinoderms, of, 34 



fowl, of, 34 



head, basophily of, 4 



salmon, of, 2 



tail, 122 



centrioles and, 107, no 

 Spermatocytes, 128 



ArveluLS, of, 55 



human, 42 



Mecistorhinus, of, 117 



mouse, of, 50 



Orthoptera, of, 80, 81, 95, 97, 102, 104, 

 109, Ii2-ii4,.i30, 144, 145 



230 



