1 68 



FERTILIZATION 



Phyla, in which polyspermy norm- 

 ally occurs, 103. 



Physostigimine, 89. 



Plasma membrane, 8, 9, 128-134. 



Plasmolysis, 99-101 ; polyhedral, 

 loi ; spherical, loi. 



Polar bodies, 3, 10, Plate II, 105. 



Pollen, quercitrin content, 51, 54; 

 rutin content, 51, 54. 



germination, inhibition of, 54. 



tube growth, effect of boric 



acid on, 54. 



Polyhedral plasmolysis, loi. 



Polysaccharides, in cortical alveoli, 

 6 ; in cortical granules, 6. 



Polyspermy, 17, 103-123; effect on 

 O2 uptake, 122; induction by 

 trypsin, 137; in particular phyla, 

 103. 



Potassium, in eggs, 129; outflow 

 during action potential (nerve), 

 126, 127, 128; permeability of 

 eggs to, 83 ; in sea water, 129. 



Potential change, after activation, 

 128, 135 ; during action potential 

 (nerve), 124-127. 



difference, across surface of 



frog's egg, 1 28 ; across surface of 

 sea-urchin egg, 129, 130, 135. 



Precipitation membrane, on egg 

 jelly, 22, 34, 37. 



Probability of successful collision, 

 p, 110-113, 136-139. 



Pronuclei, DNA content, 84-85 ; 

 movements of, 14-18, 85, 104, 

 106. 



Protamines, in spermatozoa, 36. 



Protein synthesis, by unfertilized 

 eggs, 76-78. 



Proteins, solubility of, 88-89. 



Proteolytic enzymes, activation of, 

 in eggs, 87-88 ; effect on fertilizin, 

 28. 



Protoplasmic clotting. See Proto- 

 plasmic gelation. 



gelation, 94-99. 



streaming, 16,18. 



Pseudogamous fertilization, i, 18. 



Pyruvate, metabolism, 70, 71, 78, 

 84 ; permeability of eggs, 84. 



Quercetin, 51-53 ; biological identi- 

 fication of, 53. 



Quercitrin, 51, 52, 54; inhibition of 

 pollen germination, 54. 



Random motion of spermatozoa, 



39-42, 45, 108, no. 

 Recovery phase in action potential 



(nerve), 124-127. 

 Red blood cells, agglutination of, 



137- 



Refractive index, of cytoplasm, 90; 

 of nucleus, 90. 



Regulation of metabolism, by ferti- 

 lization, 62, 77. 



Resistance, of frog's egg cortex, 130, 

 131; of sea-urchin egg cortex, 

 130-131, 135. 



change during action potential 



(nerve), 127. 



Resistivity, of cytoplasm, 131, 134- 



135- 

 Respiratory quotient, of eggs, 63- 



Reversal of fertilization, 119-121. 

 Rh antibodies in non-agglutinating 



form, 29. 

 Rhamnodiastase, 52. 

 Ribonuclease, 84, 88. 

 RNA, 76, 84-85. 

 Rigidity of cortex, 92, 95, 10 1. 

 Rotation of sperm head, 14-15. 

 Rutin, 51, 52, 54; inhibition of 



pollen germination by, 54. 



Saponin, as cytolytic agent, loi. 



Sea water, calcium in, 129 ; chloride 

 in, 129 ; effect on c of alkalinity of, 

 136; effect on cortex of calcium 

 lack in, 95 ; effect on eggs of 

 hyper- and hypotonicity of, 99— 

 10 1 ; effect on membrane capaci- 

 tance of hypotonicity, 133-134; 

 effect on spermatozoa of addition 

 of albumin to, 31 ; heavy metals 

 in, 31; magnesium in, 129; po- 



