INDEX 



291 



Richter, 93, no, 119, 127, 148, 161, 257. 

 Ricin, accommodation to, 263 ; action of, 



on algae, 261. 

 Ricinus communis, minimal temperature 



for, 232. 



Ricome, 86, 154. 

 Rieder, 105. 

 Rigidity, 50 seq. ; influence of, on tension, 



59- 



Rigor-mortis, 69. 



Rimbach, 207 ; on contractile roots, 14. 



Rimpan, 17. 



Rittinghaus, 229, 238, 254. 



Rivularia, 46. 



Robinia, leaf-fall in, 217. 



Rodewald and Kattein, 36. 



Rontgen rays, action of, on plants, 105, 

 1 06. 



Roger, 126. 



Romanes, 252. 



Root, contraction of, 13; amount of, 

 14; causes of, 14, 15; growing zones 

 in, 5, 8 ; influence of gravity on forma- 

 tion of, 109 ; light on, 87 ; on 



formation of, 93 ; on rate of 

 growth of, 96 ; medium on growth 

 of, 122; -- moist air on growth of, 

 122 ; pressure on formation of, 132 ; 

 periodicity in, 204, 207 ; pressures 

 exerted by, 125, 126, Figs. 22, 23 ; re- 

 generation of, 1 68 ; resistance of, to 

 heat, 230, 231. 



Root-apex, conversion of, into shoot-apex, 

 140 ; diagram of, 48. 



Root-hairs, influence of contact on, 129; 

 moisture on formation of, 130; 

 oxygen on development of, 115. 



Rosenberg, 43. 



Rosenvinge, 154; on polarity, 157. 



Rostafinski and Woronin, 121. 



Rothert, 9, 10, 12, 36, 134, 171. 



Rotifers, influence of cold on, 234. 



Roux, 2, 148, 157, 166; on asporogenous 

 races, 193 ; on mechanics of develop- 

 ment, 3; on post-regeneration, 170. 



Rttmex acetosella, conversion of root-pri- 

 mordia into shoots, 140. 



Ruptures due to growth, 34. 



Russow, on causes of annual rings, 216. 



Rye-haulm, strength of, 50. 



Rysselberghe, 67. 



Rzentowsky, 99. 



Sabanejew and Alexandrow, 243. 



Saccharomyces, literature on influence of 

 temperature on, 84; suppression of 

 spore-formation in, 193; temperature 

 limits for growth of, 76 ; vitality of, 

 255 ; S. cerevisiae, limits of tempera- 

 ture for growth and spore-formation in, 

 80. 



Sachs, 3, 7, 8, 9, 12, 16, 22, 39, 47, 49, 62, 63, 

 64, 69, 78, 81, 83, 86, 87, 89, 91, 93, 94, 



U 



96, 97, 98, 102, 109, 122, 132, 143, 154, 

 201, 212, 224, 226, 227, 235, 244, 246; 



on anisotropy, 73 ; apparatus for mea- 

 suring growth, 20 ; on autonomic vari- 

 ations of growth, 18; on cardinal tem- 

 peratures for growth, 76 ; on causes of 

 annual rings, 215; etiolation, 99; 

 on division at right angles, 42 ; on 

 elongation of pith, 66 ; on freezing of 

 plants, 239, 240; on growth-substances, 

 187; on influence of contact, 130; 

 medium on resistance to heat, 

 228 ; ultra-violet rays, 103 ; on 

 maximal and minimal temperatures for 

 growth, 82 ; on nature of stimuli, 75 ; 

 on origin of verticibasality, 160 ; on 

 periodicity of growth, 203 ; on phy- 

 sics of growth, 30; on plasticity, 58; 

 on resting periods, 215 ; on stages in 

 growth, 6 ; on symmetry in tissues, 48 ; 

 on ultra-maximal temperature, 225 ; 

 on zones of growth, 5. 



Sadebeck, 92, 255. 



Saline solutions, influence of, on growth, 

 118. 



Salix, early flowering of, 205 ; influence of 

 light on buds of, 94 ; inversion of, 

 155 ; S. amygdalina, cause of galls on, 

 172; regeneration of bud of, 169; S. 

 capraea^ contraction of bark of, 61, 

 Fig. 15. 



Saltatory variations, 193-6. 



Salter, 36. 



Samassa, 41, 261. 



Sames, 84. 



Sandsten, 113. 



Sanio, 7. 



Sap, freezing-point of, 241, 242. 



Saprolegnia, 39, 41 ; decrease in divid- 

 ing size of, 38; influence of food on 

 formation of reproductive organs, 116; 



on growth and reproduction of, 



117; on reproduction of, 198; 



resting periods of spores of, 208. 



Saussure, resistance of seedlings to desic- 

 cation, 252, 253. 



Scenedesmus, resistance of, to desiccation, 

 255. 



Schacht, 205. 



Schaible, 1 14 ; influence of air-pressure on 

 growth, 115. 



Schattenfroh and Grassberger, 227. 



Schaudinn, 105. 



Schellenberg, 28, 32, 45 ; influence of ligni- 

 fication on elasticity, 55. 



Schenck, 120, 121, 122. 



Schibata, 15. 



Schwbeler, 80. 



Schieberszky, 169. 



Schimper, 36, 70, 73, 8l, 85, 95, 100, 109, 

 120, 123, 208, 209, 211, 212, 213, 214, 

 217, 218, 232, 255, 258; on growth of 

 starch-grains, 35. 



