SUBJECT INDEX 



293 



Post-floration, 17, 228 



Potato, 17, 19 



Potential gradient, 103 



Precursor of auxin, 59, 6^-67, 70, 100, 

 116, 117, 213 



Presentation time, 177, 244 



Primary activity, 132-140 



Primary leaf, 23, 31, 68 



Primordium, organ, 119, 198, 199 



Proportionality between concentra- 

 tion and curvature, 27, 33, 35, 40, 

 41, 54-56 



Proportionality of growth, 52, 53, 73, 

 86, 128 



Protoplasmic streaming, 12, 19, 101, 

 102 



Protractor, 32, 33, 55 



Pruning, 207 



Pseudo-auxin, 109 



Pseudomonas, see Bacterium 



p.u. (plant unit), 41-43 



Purification of auxin, 105-112 



Quercus, 61 



Radiation, 88, 89 



Raphanus, 60, 66, 73, 88, 89, 97, 98, 



170, 171 

 Recovery, 244 



Regeneration, 18, 92, 183, 238-242 

 Regeneration of the physiological tip, 

 25, 36, 44-47, 64, 75, 76, 84, 121, 167 

 Reizmengengesetz, 245 

 Rejuvenation, 76, 77 

 Residual growth, 51, 53 

 Respiration, 128, 164 

 Reviews, 4, 5 

 Rhizobium, 248 

 Rhizocaline, 186, 190 

 Rhizogenes, 187, 190 

 Rhizoid, 241 

 Rhizome, 92, 215 

 Rhizopin, 111 

 Rhizopus, 72, 105, 106, 111, 112, 113, 



142, 190, 210, 236, 238 

 Ribes, 185 



Rice polishings, 63, 186 

 Ringing, 6, 206 

 Ring structure, 126 

 Roots, auxin formation in, 61, 144- 



148 

 Root formation, 3, 6-8, 56, 92, 97, 



100, 183-206, 218, 225, 229, 237, 



246 



Root forming substance, 183, 184, 



186, 189-192, 215, 223 

 Root germs, 185 

 Root inhibition, 141-144 

 Root nodules, 148, 225 

 Root tip, 61, 141, 142, 199 

 Root unit, 189 



Saccharomyces unit, 197 



Salamanders, 183 



Saliva, 13, 26, 42, 70, 105, 154 



Salix, 8, 61, 92, 97, 185, 192, 219 



Salts, 40, 145 



Sap, 6, 7 



Scrophularia, 208, 219 



Scutellum, 21, 100, 147 



Secale, 81 



Secondary activity or properties, 132- 



140 

 Sections of coleoptile, 52, 53, 75 

 Seeds, auxin in, 63 

 Sensitive plant, 19 

 Sensitivity of Avena, 27-29, 36, 40, 



64, 75-77 

 Sequoia, 63 

 Setaria, 84 



Sex hormones, 109, 198, 228, 234, 235 

 Shadowgraph of curvatures, 32, 34, 



48, 55 

 Shock reaction, 174 

 Short reaction to light, 174 

 Sinapis alba, 147, 211 

 Size of agar blocks, 35, 43 

 Size of plant, limitation of, 80 

 Size relationships, 231, 232 

 Solidago, 212, 213 

 Sorghum, 68 

 Specificity of auxins, 114 

 Spiraea, 219 

 Spotted wilt, 227 

 Standard deviation, 39 

 Stimulus, 152, 174, 244-247, see also 



Transmission 

 Stimulus substances, 244 

 Stoichiometric relationship, 128, 136, 



246 

 Straight growth and auxin, 51-53, 



231, 232 

 Succulents, 18 

 Suction force, 120 

 Sugars, 40, 85, 123, 124, 144, 145, 



184, 186, 189, 194, 195, 199, 218, 



237, 239 



