INDEX 



265 



Preparation and purification of 

 growth substances, from Ah- 

 sidia, 40 

 from Aspergillus, 41 

 from Rhizopus, 40 

 from urine, 43-49 



Priestley, J. H., 87, 90, 162 



Pringsheira, E. G., 105, 109, 140, 

 141, 142 



Properties of growth substances, 

 50-55 



Proteus, 62 



Protoplasmic streaming, and trans- 

 port of growth substance, 77 



Purdy, H. A., 28, 137, 153-154, 

 173, 214 



Q 



Quantitative determination of 

 growth substance, by Avena 

 curvature, Boysen Jensen's 

 method, 27-30 

 Went's method, 30-32 

 by callus-forming effect, 35-36 

 by pea test method, 34-35 

 by root formation, 126 

 Quantity-of-stimulus principle, in 

 geotropism, 174-175, 201-202 

 in phototropism, 139-140 



R 



Raalte, M. H. van, 207 

 Ramshorn, K., 78, 79, 160, 183, 196 

 Raphanus, 60, 65, 75, 95, 97, 165- 



166, 218 

 Rawitscher, F., 169, 182 

 Regeneration, 129 



physiological, 22, 58, 89-90, 206 

 Reinders, D. E., 135 

 Reinhard, A. W., 137, 139 

 Renner, O., 87 

 Respiration, 122 

 Rheum, 37, 59, 60 

 Rhizocaline, 124 

 Rhizopin, 41, 99 



Rhizopus, 3, 40, 41, 49, 62, 63, 64, 



126, 129 

 Ricca, U., 217 



Robinson, T. W., 18, 32, 89. 179 

 Root formation, 124-129, 125, 126, 



127, 128 



Root-forming substances, formation 

 of, 65 

 quantitative determination of, 126 

 Root hairs, influence of growth 



substance upon, 100 

 Rooting response to chemical com- 

 pounds, 53, 124-129, 125, 126, 

 127, 128 

 Roots, decapitation and growth of, 

 99 

 distribution of geotropic sensi- 

 tivity in, 199-200 

 extraction of growth substance 



from, 25, 207-208 

 geotropic stimulus transmission 



in, 200-201, 201 

 geotropism in, 199-211 

 growth substance in, 99-101, 207- 

 208 

 and growth of, 99-101, 115 

 quantity-of-stimulus principle in, 

 201-202 

 Roscoe, H., 139 

 Rosene, H. F., 162 

 Rothert, W., 6, 17, 29, 71, 82, 83, 



89, 95, 133, 135, 139, 164, 172 

 Rutten-Pekelharing, C. J., 174 



S 



Sachs, J., 87, 124, 150, 171, 189, 191, 



197, 199, 202 

 Sakamura, T., 64 

 Salad oil, 63 

 Saliva, bud inhibition by, 118 



growth promoting effects of, 12, 

 24 



growth substance present in, 63 

 Salix, 117 

 Salkowski, 47 

 Sambucus, 122 

 Sawdust-culture method, 18 



