SUBJECT INDEX 



Spermatocytes 



Pediculopsis, of, 122 

 Pynhocoris, of, 43 

 Psophus, of, 71 

 Stetiobothrus, of, 195 

 Sphacelaria, mitosis in 

 duration of phases, 85 

 viscosity changes in, 137 

 Spermatogonia, 94, 109, no 

 Sphere attractive, 107 

 Spiders, 40 

 Spindle 



attachment, diffuse in Hemiptera, 92 

 mitotic, 77, 78, 92, loi, 103, 106, III, 

 1 19-135, 146 

 anaphase, shortening before, 127 

 appearance in life, 122 

 birefringence of, 119-120, 123, 126, 127, 



132 

 chromosomes unattached to, abnormal 



behaviour, of, 115 

 curvature of, 128, 130 

 dynamics of, 115-119, 125-130 

 elongation and growth in anaphase, 127, 



128 

 equilibria in, 195 



expulsion of granules from, 117, 125 

 extrusion from cell, 131 

 fixation, effects on, 119 

 formation of, 79, 143 



plant cells, in, 72 

 hyper tony, effects of, 81 

 inhibition of, 143, 183, 1 91-196 



grades in, 191, 197 

 interzonal expansion of, 115, 144 

 polar contraction of, 1 15-116 

 pressure, effects of, 138 

 relative sizes of, 129-130 

 retardation curves from, 120 

 -SH groups in, 195 

 structure, 120 



tactoids compared with, 130-133 

 Spinach, ultraviolet absorption in cells of, 15 

 Spirals 



chromosomes, in, 92-95, 100 



seen in life, 72, 73 

 minor, 100 

 Spirogyra, 86, 87 



cytokinesis in, 147, 148 

 Spirotrichonympha, chromosomes of, 95 

 Spleen, changes in leucaemia, 64, 181 

 Splitting of chromosomes, 78, 79 



doubts on, 93, 94 

 Staining in biology, 3, 13 

 Starvation, nucleic acid, 44 

 Stetiobothrus, spermatocytes of, 195 

 Steatococciis, diffuse spindle attachment in, 197 

 Stemmkorper theory, 115, 128 

 Stockholm school of cytology, 11, 40 

 Stomata, chromonemata in guard cells, 32 

 Strong jlocentrotus, 87 

 eggs of, 190 



heteroploid gastrulae, 54 

 Subcellular functional units, 179, 181 

 Sucrose, hypertonic, 74 

 entry into PMCs, 135-136 

 suspension of nuclei in, 33, 37, 103 



Sudan black, colours heterochromatin, 51 



Sulphydryl 

 groups 



activate proteolytic enzymes, 172 

 cytochemical methods for, 196 

 mitotic stimulation and, 172 

 proliferating tissues, increase in, 166 

 protein denaturation, and, 195 

 spindle, in, 195 

 reactants 



mitosis, inhibition by, 186 



anaphase in, 195 

 nuclear reconstruction, inhibition of, 196 



Supplementation methods, 176 



Surface tension, 142 



Susceptibility experiments, 135 



Synapsis, 151 



Tactoids, 124, 127 



negative, 115, 131, 132 



positive, 131 



spindle, and, 130-133 

 Tamalia, spermatocytes of, 128 

 Tannins, inhibition of cytokinesis by preci- 



pitants of, 147 

 Telophase, 32, 41, 42, 43, 44, 70-81, 92, 1 12, 



134, 137, 146-148, 186, 196 

 • cytoplasmic changes in, 82 

 duration of, 85 



inhibition of by hypertony, 74 



DNA synthesis following, 80 



nucleus, swelling in, 80, 104 

 Temperature coefficient, see Q,io 

 Tensions, elastic, postulated in spindle, 126 

 Tetraploidy 



cells, in, 61 



whole organisms, in, 53-55 

 Theory 



Heilbrunn's, of protoplasmic stimulation, 

 140, 194 



traction-fibre, of anaphase, 116, 118, 127 

 Thermodynamic activity, 194 

 Thixotropy of cytoplasm, 27 

 Threonine, 49 

 Thymine, 5 

 Thymonucleic acid, 3 



carbohydrate of, 5, 6 



viscosity of Na salt of, 9 

 Thymus gland 



growth regulator, as, 171 



preparation of DNA from, 3 

 Thyroxin, 171 



Time-lapse film, 71, 75, 77, 78, 84, in, 125, 

 126, 184 



intracellular movement in, 22, 30 



measurement of nuclear size from, 60 

 Tissue cultures, 20-21, 26, 30, 31, 51, 53, 59, 

 71, 78, 88, 90, 102, 103, 116, 128, 



i30» 133. 134. 143. 144. 152, 153. 



164, 169-178, 182, 184-186, 189, 



190, 193, 196-197, Plates I, II, XII- 



XIV 

 cell migration in, 189 

 tissue extracts, effect of 



adults, 174 



embryos, 173-175 

 ' wounding', effects of, 171 



231 



