INDEX 



349 



Proteoses, treatment of, 164, 165 

 Protoplasm, arrangement of components, 

 2 



composition of, 1,2 



constitution of, I 



forces to which it reacts, 4, 5 



theories of structure, 219, 220 



volume relations of, 276 

 Protoplasts, physical constitution of, 175 

 Prunits laurocerasuSy movements of 

 branches, 97 



lusitanica, movements of branches, 



97 



passage of air through leaves of, 192 

 Pulvini, structure and action of, 14, 15 

 Puriewitsch, on respiration, 252, 260, 262 



Quercus, structure of etiolated stems, 



115, 116 

 See oak 



Radish, influence of electricity on germi- 

 nation of seeds, 105 

 resistance of seeds, to desiccation, 66 



to heat, 92, 93 

 Ranunculus ficarioides , structure of leaf, 



125, 126 



propagation of, 319 

 Reactions, nature of, 7 

 Reinke, on correlation of root and shoot, 



303 



Remer, on awns of grasses, 179 

 Reaction time, in geotropism, 73, 74 



in phototropism, 132 

 Reproduction, 308-327 

 R.aphanus sativus, phototropic sensitive- 

 ness of, 132 

 Respiration, 250-272 



nature of, 40, 41 



influence on weight, 256 



of oily seeds, 255 



influence of ether on, 252 



of anaesthetics on, 252 



of nutritive substratum on, 261 

 Respiratory quotient, 250, 260, 261, 262 

 Resting periods, 297, 298 

 Rhododendron maximum, thermotropic 



reactions of, 97, 98 

 Rheotropism, 67 



of plasmodia, 69 

 Rhythm, 296, 297 



Rhythmic effects of alternating stimula- 

 tion, 79, 80 



Richards, on influence of chemicals on 

 plants, 63 



on respiration of wounded plants, 

 253 



Ricinus, fats of, 1 68 



Rigor, 6, 39 



Rijn, on glucosides, 157 



Roots, curvatures of, 28, 29, 34 

 geotropic reactions of, 73-81 

 origin of secondary, 32, 33 

 phototropic curvatures of, 136 

 ,/ propagation by, 316 



Root-cage, 32 



Root-pressure, 187 



Rosa, callus formation by, 38 

 propagation by roots, 316 



Rosebay, thermotropic reactions of, 97, 

 98 



Rostowzew, on bulblets of Cystopferis, 

 313 



Rothert on heliotropism, 130 



Rubus, propagation of by roots, 316 



Rumex, propagation of by roots, 316 



Sacchari meter, Einhorn's use of, 156 

 Saccharose, 149, 150 

 Sachs, demonstration of recovery from 

 wilting, 211 



on venation of leaf, 201 

 Sagittaria, leaf-forms in, 70 

 Salix, callus formation by, 38 



length of air passages in, 194, 195 



lenticels of, 192, 193 



water cultures of, 226 

 Sambucus, lenticels of, 192, 193, 194 



tensions in stems of, 183 

 Sap, ascent of, 210-216 



mechanism of, 215, 216 



path of, 211, 212, 213 



rate of, 213, 214 



Saprophyte, nutrition of, 244, 245 

 Sarauw, investigations on mycorhizas, 



248 



Sarracenia, pitchers of, 272 

 Saxifraga, propagation of, 325 

 Scapania, gemmae of, 312 

 Schaible, investigations on influence of 



partial vacua, 234, 300 

 Schenck, on aquatic plants, 70 

 Schimper, on water cultures, 224, 225, 



226 



Schneider, on lichens, 248 

 Schulze, on effects of chemicals on yeast, 



63 

 investigations on disintegration and 



formation of proteids, 239 

 Schwendener, demonstration of action of 



stomata, 198 



Sciuroides, brood-bodies, 311 

 Scutellum, action of secretion of on starch, 

 269 



