INDEX. 



337 



Rectipetality, 191 



Eeinke, on imbibition, 112 n., 113 n., 

 117 



Reseda luteola, for respiration ex- 

 periments, 10; pollen of for 

 chemotaxis, 217 



Eesins in extracts, 242 



Respiration, 1 ; apparatus, 2, 4, 

 7; in relation to growth-curva- 

 ture, 167 ; necessary for growth, 

 143, 144, 158; intramolecular, 

 10; warmth produced during, 11 



Rheum for assimilation experi- 

 ments, 31 



Richardia, longitudinal tension in, 

 133 



Riciuus, anthocyan in, 52; for 

 osmotic experiments, 126; tan- 

 gential shrinking of tissues of, 

 in water, 136 



Rigidity of a turgescent shoot, 

 lessened by bending, 139 



Ritthausen on proteids, etc., 249 



Robinia, chlorotic, 56 



Rochea falcata, fixation of oxygen 

 and increase in acidity in, 13 



Root, tip of, alone sensitive to 

 gravity, 174 n.; tip of sensitive 

 to contact and injury, 176 



Root-pressure, 74; replaced by 

 column of mercury, 78 



Roots, absorption of water and salt 

 by (De Saussure's experiment), 

 73; curvature of towards moist 

 surface, 213; dead, absorption 

 of water by, 78; effect of de- 

 capitation on, 173 ; diageotropic, 

 193, 194; flaccid, curving when 

 wetted on one side, 178 ; func- 

 tions of, 73 ; geotropisrn of not 

 due to plasticity, 167; nega- 

 tively heliotropic, 182 ; shorten- 

 ing of, 136 



Rothert, on measurement of curved 

 shoots, 164; on transmission 

 of heliotropic stimulus, 183 



Rubidium, in culture of fungi, 70 



Rumex, epinastic leaves of, 198 



Sachs, his apparatus for respira- 

 tion, 3; on apogeotropism of 

 grass-haulms, 105 n. ; on the 



D. A. 



arc indicator, l-">2; on autono- 

 mous movements of Trifolium, 

 230; on the auxanometer, 149; 

 on blocking of stomata by water, 

 109 ; on change of form in apo- 

 geotropic stems, 165 ; on chlo- 

 rophyll formation in Pinus, 55 n. ; 

 on the effect of light on chloro- 

 phyll, 51 ; on effect of tempera- 

 ture on chlorophyll formation, 

 55 n. ; on effect of iron on chlo- 

 rophyll formation, 57 n.; on 

 chlorotic plants, 56; curvature 

 in connection with growth ex- 

 periments, 157; on sudden cur- 

 vature of apogeo tropic shoots, 

 171 n.; on use of cyclometer, 137; 

 on effect of darkness on Mimosa, 

 204; on diageotropism, 194 n.; 

 on extrusion of water under 

 pressure, 78 n. ; on filtering 

 emulsion through wood, 91 ; on 

 a formula for water-culture, 59 n.; 

 on gain in weight by assimilating 

 leaves, 31; on geotropic after- 

 effect, 171 n.; on geotropic 

 growth of roots into mercury, 

 168; on grand period, 147 n.; 

 on Gris' experiment, 57 n.; on 

 growth of roots depending on 

 respiration, 144 n. ; his hot-box, 

 16 ; on hydrotropisrn, 197 ; on 

 injurious temperatures, 14 n., 15; 

 on the iodine method, 21; on 

 vertical klinostat for growth ex- 

 periments, 161 n. ; on Knight's 

 experiment, 168; on Larninaria 

 for imbibition experiments, 112n.; 

 on loss of weight by transloca- 

 tion, 32 ; on the microscope for 

 growth measurements, 152 n. ; 

 on permeability of wood, 81 n. ; 

 on recovery of flaccid shoot, 

 91 n. ; on root-pressure, 76 ; on 

 tensions of tissues, 133 n. ; on 

 transpiration apparatus, 83; on 

 warmth produced by germinat- 

 ing peas, 11 ; on water-culture, 

 58 



Sachsse's method for estimating 

 amides, 257 ; solution , 267, 282, 

 285 



99 



