16 



PHYTOHORMONES 



TABLE I 



Shows the Development of Four Apparently Independent Lines op 

 Plant Physiology, and Their Gradual Synthesis through the Discovery 

 OP THE Functions op the Auxins. (Heavy arrows indicate direct re- 

 lationship between one piece of work and another, dotted arrows a 



PARTIAL relationship OF SOME KINd) 



Organ formation 

 V 



I 

 I 



Correlalion 



Vochting 

 I 



(Klebs) 



(Goebel) 

 I 



DuHamel 



Sachs 



\ 



Beijerinck 



I 

 I 

 I 

 I 



Vochting 

 I 

 I 

 I 



Tropisms 



Sachs 



i 



Growth 



Sachs 



Loeb^ 



Dostal 



K / 



Boysen Jensen 



Darwin 



\ 



Rothert 



I 



Pfeffer 



I 



Fitting 





Blaauw 



Paal 



\ 



Stkrk 



Soding 



T 



Cholodny 



1 



Went 



effer 



1758 

 1870 



1880 

 1890 

 1900 



1910 



1920 



1925 



)1UU 



1 



Vei 



I 



1930 



Kogl and Haagen Smit 



Bouillenne and Went 



\A 



Thimann and Skoog 



/ 



Thimann and Went 

 I 



Recent developments in the auxin field 



1936 



