SUBJECT INDEX 



Extended state, of interphase chromosomes 



32 

 Extract 



embryonic, 169 



effect on tissue cuUures, 164, 173-178 



cell migration and mitosis, in, 175 



not species-specific, 173 



time relations in, 177 

 cytoplasmic in origin, 178 



affected by ultraviolet light, 1 72 



proteolytic activity of, 172 



Faith, 210 



Fertilization, 70, 135, 139, 140 



compared with cleavage, 140 

 Feulgen reaction, 5-8, 30, 32, 33, 35-37, 39. 

 64, 79, 80, 92, 100-105, III 



calibration of, 36 



hydrolysis for, 36 



quantitative use of, 7, 35-37 



salivary chromosomes, in, 17 



validity of, 7 

 Fibres, spindle, 1 19-122 



living and fixed state, in, 120 



reversible formation by acid, 122 

 Fibroblasts, 20, 134, 144, 145, 152, 164, 171, 

 172, 196 



growth of, extracts inhibiting, 1 74, 1 75 

 stimulating, 170, 173-174 



substances necessary for, 175-178 



term loosely used, 20 

 Fine structure 



cytoplasm, 24-28 



nuclear membrane, 52 



spindle, 120-122 

 Fission, in Amoeba, inhibited by same agents 



as locomotion, 198 

 Fixation 



effect 



cell cations, on, 52 

 nuclease digestions, of, 10 

 spindle, on, 119, 121, 122, 124 

 subsequent effect of stains, on, 3 



even dispersion of DNA, for, 37 



Golgi network, for, 22 

 Flagellae, no, 122 

 Flagellates, hypermastigote, 108, 209 

 Fluoracetate, 189 

 Fluoride, sodium 



effect on erythrocyte permeability, 185, 187 



mitotic inhibitor, as, 185-187, 191 

 Forces, postulated, in chromosome move- 

 ment, 1 15 

 Foreskin, mitosis in, 91 

 Formalin, 36 



as fixative, 101 

 spindle, for, 121 



unsuitable for nuclease digestions, 10 

 Fowl, DNA content of cells 



erythrocytes, 34, 36 



sperm, 34 

 Fractionation 



cell, I 



cytoplasm, 23, 179 



embryo extract, 178 



nucleus, 63-65 

 Freeze-drying fixation, 13 



Frog, egg of, 143, 197 

 cleavage in, 89 



permeability changes during, 135 

 erythrocytes of, DNA content, 34 

 leucocytes, amitosis in, 151 



chromonemata in living, 32 

 nuclei of, 81, 105 



intervesicular boundaries in, 32 

 oocyte of, dissolution of nucleoli in, 41 

 Fundulus, embryo of, nucleus vesicular, 32, 33 

 Functional differentiation, 167 

 Furfural, 4-6 



'Furrow-determining' substance, postulated, 

 139 



Callus 



DNA content of cells 

 erythrocyte, of, 34, 36 

 sperm, of, 34 

 duration of mitosis in, 85, 88 

 Gelation 



cortical, 139, 141 

 spindle, in, 125 

 mitotic, 140, 194 

 reversible, in cytoplasm, 138 

 effect of pressure on, 138 

 Generalization, tendency towards, 209 



possible disadvantages of, 210 

 Genes, 96 



said to be distinguishable in salivary 

 chromosomes, 97 

 Germinal vesicle, see oocyte nucleus 

 Gerris, polyploidy in, 149, 150, 151 

 Girdle- wall, in cytokinesis of Spirogyra, 147, 



148 

 Gladiolus, gi 

 Globulins, serum, 172 

 Glucose, 91, 171, 189 



needed to maintain mitosis in severed ear- 

 lobes, 187, 188 

 Glutamic acid, 49 

 Glutathione, 171, 172 



reactivation of heated embryo extract by, 

 172 

 Glycolysis 



aerobic, and entry into mitosis, 188 

 erythrocyte membrane, at, 187 

 Goldfish, tumour of, 62 

 Golgi body, 20-22 



disappearance in mitosis, 134 

 granular in tissue cultures, 2 1 

 myelin figures and, 21-22 

 Gomori reaction, 17 

 Gomphocerus, spermatocytes of, 102 

 Grasshoppers, short-horned, negative hetero- 



pycnosis in, 44 

 Growth 



factors promoting, 168 

 plants, in, 165-166 

 tissue cultures, in, 169 

 hormones, 168-170 

 trephones as, 170 

 ignorance concerning, 168 

 term deceptively simple, 163 

 Guanylic acid, effect on mitotic rate in 



cultivated ovaries, 189 

 Guinea pig, liver of, 64 



224 



