Contents 



Chemical configuration and action of different growth sub- 

 stances and growth inhibitors: new experiments with the 

 paste method. H. Linser {Linz) ■ ■ ■ • • 141 



The action-concentration curves of mixtures of growth- 

 promoting and growth-inhibiting substances. K. Kaindl 

 {Linz) 159 



The chemical induction of growth in plant tissue cultures. 



F. C. Steward and E. M. Shantz {Cornell) . . . . 165 



The degradation of certain phenoxy acids, amides, and nitriles 

 within plant tissues. C. H.Fawcett, H.F. Taylor, R. L. Wain, 

 and F. Wightman {Wye) . . . . . . 187 



Relationship of molecular structure of some naphthyloxy 

 compounds and their biological activity as plant growth 

 regulating substances. L. C. Luckwill and D. Woodcock 

 {Long Ashton) 195 



Studies on the relation between molecular structure and pene- 

 tration of growth regulators into plants. J. van Overbeek 

 {Modesto) 205 



The resolution of phyto-hormone acids by means of their 

 optically active phenyhjopropylamides. Resolution of 

 a- (1-naphthyl) -propionic acid. J. M. F. Leaper and 

 J. R. Bishop {Ambler) 211 



III. METABOLISM AND MODE OF ACTION 



Some metabolic consequences of the administration of indole- 



acetic acid to plant cells. A. W. Galston {Pasadena) . . 219 



Chromatographic investigations on the metabolism of certain 

 indole derivatives in plant tissues. R. C. Seeley, C. H. Fawcett, 

 R. L. Wain, and F. Wightman {Wye) . . . . 234 



The effects of synthetic growth substances in the level of 

 endogenous auxins in plants. L. J. Aitdns and Ruth Thresh 

 {London) 248 



Interrelationships between the uptake of 2 :4-dichlorophenoxy- 

 acetic acid, growth, and ion absorption. G. E. Blackman 

 {Oxford) 253 



Auxin-induced water uptake. J. Bonner, L. Ordin, and R. Cleland 



{Pasadena). 260 



viii 



