SUBJECT INDEX 



Arbacia 



egg of, cleavage, effect of Ca-free sea water 

 on, 141 

 in enucleated half-egg, 143 

 inhibition of, 198, 199 

 mathematically treated, 144 

 cytoplasmic DN-ase, inhibited by usnic 



acid, 197 

 DNA content of, 34, 35 

 effect of colchicine on, 193 

 embryonic nuclei of, 38 

 movements of K in, after fertilization, 



140, 141 

 oocyte nucleus of, 53 

 P*^ uptake reduced by dinitrophenol, 1 99 

 permeability changes in, 135 

 phosphorylation in cell-free systems 



prepared from, 199 

 viscosity' changes in, 136, 140 

 sperm of, DNA content, 34, 35 

 Area 



nuclei, 54, 55, 57 

 nucleoli, 42 

 Arginase, in liver cells, 50 

 Arginine, 48-50 



cytochemical method for, 47 

 Arrhenatherum, mitosis in living cells of, 73, 



74> 85 

 Arsenlte, sodium, as mitotic inhibitor, 195 

 Aromatic amino-acids, absorption spectrum 



of, II 

 Artefacts, fixation 

 centriole, 108 

 interphase nucleus, 33 

 nuclear membrane, 51, 52 

 spindle fibres, 1 1 9 

 Artemia 



cleavage of enucleate blastomeres in, 143 

 heteroploidy, in, 54, 55 

 Arvelius, spermatocytes of, different sized, 

 55-56 

 DNA, RNA, and protein content of, 55 

 Ascaris, eggs of 



central bodies of, 107, no 



effect of oxygen on, 82 



Feulgen reaction of nucleus equal to that 



of sperm, 35 

 Qio of mitosis in, 87 

 Ascorbic acid, 171 

 Ash 



chromosomes, of, 104-106 

 nuclei, of, 106 

 Aspartic acid, 49 

 Asterias, 135, 190, 193, 194, 197, 199 



oocyte nucleolus of, 39 

 Asters, 131, 137, 138, 140, 144 



in fibroblasts, recognizable but small, 144 

 rays long known, 106 

 relation to centrioles, iio-iii 

 role of, in cleavage, 142 

 sea-urchin egg, 123 

 ATP, effect on Strongylocentrotus egg, 190 

 Autolysis, and nucleoclastic enzymes, 3 

 Autosomes, 1 1 7 



heterochromatin of, in Bryophyta, 44 

 Azo dyes, used in histology, 2 

 Auxin, see indolylacetic acid 



Bacteriophage, 97 

 Bands, spiral flagellar, 92 

 Barley, seedlings of, 188 

 Basophilia 



centrioles, of, 1 1 1 



chromosomes, of, 79 



cytoplasm, of, 3 



nucleolus, of, 9, 39 



reduced after ribonuclease digestion, 9, 13 

 Basic proteins, 12, 47-48, 52 



cytochemical test for, 12, 39 

 Benzimidazole, effect on nucleoli in chick 



cultures, 40 

 Bimodal distribution, 58, 59 

 Binucleate cells, 51 



formation 



amitosis, by, 152, 153 

 mitosis without cleavage, 149 



liver, in, 61, 149, 153 



mitosis of, formation of polyploid nuclei, 

 61, Plate XI 

 Biophysics, mathematical, 23, 143 

 Birefringence 



cytoplasmic, 25 



chromosomes, of, 97-98 



nuclear membrane, of, 52 



nucleic acids, of, 97 



secondary, of interzonal region, 144 



spindle, of, 1 19-120, 123, 126, 127, 132 



streaming, 25 



tactoids, of, 131, 132 

 Bivalent, 1 13- 11 5 

 Blastomeres, 138 



nuclei, of, 63 

 Blebs, polar, from spermatocytes, 145 

 Blepharoplasts, and centrioles, no 

 Bodo, mitosis in living, 75 

 Bone marrow, mitodc waves in, 91 

 Bouquet stage, 111-114, 119 



heterochromatin in, 111-112 

 Brownian movement, 119, 147 



intracellular motion in fibroblasts more 

 than, 22 



observed in viscosity estimations, 136-137 

 Bryophyta, heteropycnosis in, 44 

 Bubbling, at cell surface during cleavage, 

 144-146 



readily exaggerated, 196 

 Bufo, negative heteropycnosis in autosome 



of, 45 

 Bull, sperm of, 34 _ 



Butter yellow, 50 



Cacodylate, sodium, as mitotic Inhibitor, 195 

 Calcium 



bound, in egg, 140 



chromosomes, in, 105, 106 



cortical release of, postulated by Heil- 

 brunn, 140 



nuclei, in, 106 



proteinate, 52 

 Calf thymus, nuclear DNA, 34 

 'Calottes polaires', 72 

 Carbon 



formate, incorporation into nucleic acids, 

 200 



monoxide, 188, 189 



220 



