Portraits of Cholodny and Went from Wikipedia

In the 1920s, work on #auxin as "growth substance" intensified, with Frits Warmolt #Went & Nikolai Grigoryevich #Cholodny both publishing a series of papers on the role of this first described #phytohormone. By 1926 both had determined that auxin plays a role in the plant's tropisms.