Went removed the tips from coleoptiles, and placed them face down on blocks of agar for about an hour.  
The discovery of this group of substances was influenced by earlier experiments by Charles Darwin, Boysen-Jensen, and Paal.  Frits Went removed the tips from coleoptiles, and placed them face down on blocks of agar for about an hour.  The blocks could then be attached to the original plant in order to make it resume growth or bend, proving that the stimulus was chemical.  Also responsible for the maintenance of apical dominance and the initiation of root formation in cuttings, FTP, identify this class of plant hormones including indoleacetic acid, named by Went from the Greek word for "increase."
The discovery of this group of substances was influenced by earlier experiments by Charles Darwin, Boysen-Jensen, and Paal.  
auxins