INDEX 



(Pages referring to illustrations are in boldface; text references always precede) 



Abscission, 129 



Absidia, 40, 62 



Acalypha, 124 



Acer, 129 



Acid growth reaction. 113-115, 114 



Acidity, and geotropism, 195 



and growth, 113-115 

 Acids, effect of, on bud inhibition, 

 118 

 on nastic movements, 123, 128 

 on rooting, 127-129, 127, 128 

 Activity of growth substances, auxin 

 a, b, heteroauxin, 43-51 

 other compounds, 52-55, 75 

 upon rooting, 53 

 AE [Avena Einheit), definition of, 



33 

 Aeration of culture medium and 

 growth-substance formation, 64 

 Aesculiis, 60, 117 

 Agar blocks, corn-paste, 38 

 first use of, 12, 4 

 percentage of agar in, 25, 31 

 pollen in, 25 

 size of, 29, 31 

 transport from, 79 

 unilateral application of, 22, 4, 21 

 over vascular bundle, 30 

 Agrostemma, 100, 164, 215 

 Ahrens, A., 191 

 Akerman, E. A., 16 

 Algae (see Valonia) 

 Amino-acids, 42, 64 

 Amlong, H. U., 183-184, 196, 209- 



210 

 Anderson, D. B., 105 



Animal cells, significance of growth 



substance for, 102 

 Animal hormones, folUcle hormone, 

 64 

 {See also Supplementary bibli- 

 ography) 

 Apical dominance, 117 

 Arachis {see Peanut) 

 Arisz, W. H., 139, 141-142, 143, 147 

 Artichoke, 79 

 Asparagus, 59 

 Aspergillus, 3, 41, 49, 62. 63, 64, 



101, 102, 104 

 Automatic photographic method, 32 

 Auxenolonic acid, 46 



(See also Auxin 6) 

 Auxentriolic acid, 43 



{See also Auxin a) 

 Auxin, definition of, 40 



{See also Auxin a; Auxin b; 

 Heteroauxin) 

 Auxin a (auxentriolic acid), deriva- 

 tives, effectiveness of, 46, 52 

 effectiveness of, 46, 52 

 preparation of. from urine, 43-47 

 properties of, 50-51 

 sources of, maize-oil, 46 

 malt, 46 

 urine, 43 

 structural formula of, 50 

 Auxin b (auxenolonic acid), deriva- 

 tives, effectiveness of, 52 

 effectiveness of, 47, 52 

 preparation of, from linseed oil, 

 47 

 from maize oil, 46 

 from malt, 46 

 from mustard oil, 47 

 from peanut oil, 47 



255 



