SUBJECT INDEX 



Permeability 



cell membrane, changes during mitosis, 

 135-136, 140 



nuclear membrane, 53 

 Petromyzon, oocyte of, nucleoli in, 40 

 Phagocytosis, by fibroblastic cells, 26 

 Phaseolus, heterochromatin in, 51 

 Phasmids, pre-metaphasc stretch in, 113 

 Phenol red, penetrates oocyte nuclear mem- 

 brane of starfish, 53 

 Phenyl urethane, effect on Arbacia egg, 142 

 Phenylalanine, 49 



absorption spectrum of, 1 1 

 Phosphagen, 106 

 Phosphatases 



acid, 49, 50 



alkaline 



chemical nature of, 50 

 chromosomes, in, 17, 50 

 nucleoli, in, 40, 50 



cerebral cortex and rat liver nuclei, 49 



protein synthesis, associated with, 17, 40 

 Phospholipines, 179 



myelin figures, and, 21 



nucleus, in, 50, 51 

 Phosphorus, 36, 105-106 



nuclein, in, 2 

 Phosphorylation, in cell-free systems, 199 

 Phragmoplast, 146-149 



colchicine, affected by, 198 



hollow in some Algae, 147-148 

 Pigment granules, in egg cortex, 139 

 Pinocytosis, 22 



Pisum, duration of mitosis in, 83, 85, 91 

 Pith, elder 



artificial asters in, no, in 



infiltrated by frog leucocytes, 152 

 Plane of cleavage furrow, determination of, 



139. 

 Plasma, chicken 



medium for tissue cultures, in, 1 69, 172, 175 



peptides in, 172 

 'Plasmal' reaction, 6 



Plasmodium of slime-mould, rhcology of, 25 

 Plasmolysis, 135 

 Plasmosin, 24 



Plasmosome, 39, see also nucleolus 

 Ploidy of nuclei, changes in, 61, 149-151 

 Podophyllin, 143, 193 



composition of, 192 

 Podophyllotoxin, 192, 193 

 Podophyllum, extraction of podophyllin from, 



192 

 Polar bodies, 98 

 Polarity in Echinus oocyte, 1 19 

 Pole-caps, 72, 73 

 Pole-field, 73 

 Pollen 



grain, of Lilium, DNA content of, 37 



mother cells, 90, 94, 105, 115, 134-137, 147 

 cultivation of, 75 

 nucleoli of, 16 



tube, mitosis in, 75 

 Polynucleotides, 12 

 Polyploidy, 150 



larval ileum of Culex, in, 61, 151 



mitosis of binuclcate cells, by, 61, 149 



Polysaccharides 



bacterial, effect on tumours, 193 



effect on marine eggs in cleavage, 194 

 Polytcne chromosomes, 98 



tumours, in, 62, 63 

 Polytomella, P^* uptake in, 16 

 Porcellio, amitosis in, 153 

 Potassium, 52 



chloride, changes of solubility of egg 

 proteins in, 139 



ions, movements of, after fertilization in 

 eggs, 140, 141, 187 



leakage from erythrocytes, 185, 187 

 Pre-haemolytic state, 187 

 Pre-metaphase stretch, in Mantids and 



Phasmids, 11 3-1 15, 117 

 Pretreatment before fixation, 100 

 Probability paper, 57-59 

 Proline, 49 

 Pronuclei, 107, 190 



fusion prevented by usnic acid, 197 

 Prophase, 30, 92-95, 102-104, 118, 119, 129, 



133-135, 137, 139, I5i» 153, 187, 191. 

 196 

 inhibition of mitosis during, 183, 190, 199 

 living nucleus, in, 70-79, 1 1 1 

 duration of, 73, 85 

 prolonged by irradiation, 190 

 volume changes in, 57, 73 

 Protamine, 2-3, 103 



molecular weight of, 47 

 Proteins 



basic, 12, 47, 48, 52 

 breakdown products of 



culture media, in, 172-173 

 chromosomes, of, 92, 103-104 

 nucleoli, 40, 47 

 nucleus, some enzymic, 47-50 

 reversible denaturation of, 194, 195 

 'structure', 24-25 

 synthesis of, 104, 171 

 Protenor, spermatocytes of, 128 

 Proteolytic enzymes, activated by -SH 

 groups, 172 

 chromosomes, effect on, 103 

 embryo extract, in, 172 

 nucleases contaminated by, 10 

 postulated at cell surface, 1 72 

 Proteoses, 172 



Protoanemonin, mitotic inhibition by, 190 

 Protoplasm, vir, 3 



fine structure of, 27 

 Protoplasmic 



clotting, Heilbrunn's theory of, 140, 194 

 streaming, 140 



mitochondrial movement, and, 23 

 pressure on, effect of, 138, 149 

 Tradescantia, ceases during mitosis in, 



72, 135 

 Protozoa, 149 



mitosis in living, 75-76 



insensitive to podophyllin, 193 

 spiral chromosomes in, 95, 100, 134 

 Psammechinus, egg of 



mitosis and cleavage in, 89, 128, 139, 



Plate XIII 

 ultraviolet absorption in, 15 



229 



