232 



INDEX 



Pfeffer, 153. 



Pfliiger, 66. 



Phosphorescence, 66. 



Photochemical reactions, in assimilation in 



plants, 114- 

 in heliotropism, 119. 

 Pictet, in. 

 Picton, 51. 

 Fieri, 175. 



Pigment granules in Tubularia, 205. 

 Planarians, reactions to light, 136. 



heteromorphosis and regeneration in, 



210. 



Planorbis, \g6. 



Plants, nutritive solutions for, 71. 

 Platinum-black, enzyme action of, n. 

 Polarity in Tubularia, due to a current, 203. 

 Polygordius, heliotropism in, 133. 

 Poly orchis, effect of ions on, 87, 88, 91. 



galvanotropism in, 141. 

 Poize niusz, 22. 



Porthesia, heliotropism of, 126. 

 Potassium, non-dissociable compounds 



with protoplasm, 73. 

 Prentiss, 152. 

 Protective solutions, 77. 

 Proteins, amphoteric character, 35. 

 Proteolytic enzymes, general occurrence 



of, 12. 



Protoplasm, structure of, 31. 

 Protoplasmic motion, 55. 

 Przibram, 215. 



Psychology of lower forms, 158. 

 Purgative effects of salts, inhibited by 



Ca, 93. 



produced by Ca precipitants, 93. 

 Purkinje, 145. 

 Pycnopodia, 162. 

 Pyrrhocoris, spermatozoa of, 188. 



Quincke, 32, 38, 40, 55. 



Radiant energy, origin of in organisms, 66 



general effects on living matter, 112. 

 Radiation pressure, 113. 

 Radl, 113, 150. 

 Radziszewski, 67. 

 Ramsden, 38. 

 Raulin, 72, 79. 

 Rayleigh, 32. 

 Reaction of living matter, 95. 



of sea water, 95. 



effect of green plants on, 98. 

 Reaction velocity, effect of heat on, 108. 



in biological processes, 109. 



in heartbeat, 109. 



in heliotropism, 130. 

 Recessive characteristics, 184. 

 Regeneration, in plants, 200, 207. 



in Cerianthus, 207. 



in Planarians, 210. 



in earthworm, 214. 



influence of central nervous system, 213. 



Regeneration (continued) 



correlation in, 213. 



effect of external conditions on, 217. 



distribution in animal kingdom, 221. 



and natural selection, 222. 

 Regenerative processes, 199. 

 Reid, 34. 



Respiration as a catalytic process, 13. 

 Reversible processes, in enzyme action, 9. 



in regeneration, 218. 



in Campanularia, 219. 



in Planarians, 221. 

 Rheotropism, 159. 



Rhythmical contractions, of skeletal mus- 

 cle, 78. 



effects of salts of univalent metals, 78. 



effects of Ca and Mg, 79. 



absence in non -electrolytes, 82. 



effect of Ba salts, 87. 

 Richardson, 114. 

 Richet, 19. 

 Ringer, 87. 



Ringer's solution, 75. 

 Rogers, 75, 97. 

 Romanes, 80. 

 Rotifers, 187. 

 Roux, 64, 66, 159. 

 Rusch, 76. 



Sachs, 59, 121, 199, 200, 201. 



Salmon, 4, 198. 



Salts, antagonistic effects of, 46, 75 ff. 



diffusion into cells, 42. 

 Schmiedeberg, 17, 93. 

 Schoenbein, 21, 24, 27, 114. 

 Schultze, 197. 

 Schweitzer, 145. 

 Secretion, 44, 50. 



produced by galvanic current, 93. 



produced by Ca precipitants, 93. 



formation of egg membrane resembles 



secretion, 174, 177. 

 Segmentation, need of oxygen in, 17. 

 Selective power of cells, 72. 

 Semicircular canals, 150. 

 Semipermeable membranes, 39, 69, 101. 

 Sensory nerves, irritability increased by 



Ca precipitants, 91. 

 Sequoia, 5, 223. 

 Serpula, 123. 

 Setrhell, 106, in. 

 Sex, determination of, 186. 



in egg, 187. 



in spermatozoon, 188. 



attempts to influence, 190. 

 Sexual characters, secondary, 190. 

 Siebold, 165. 

 Snyder, 109. 

 Sodium, unimportant for plants, 72. 



importance in muscular contractions, 



7- 



Sols, i. 

 Spallanzani, 161. 



