The detection of the Kautsky effect, i.e. the chlorophyll (Chl) fluore
scence induction kinetics induced in the dark-adapted leaves because o
f a sudden irradiation, by Hans Kautsky and his students is reviewed h
ere on the occasion of the 60th anniversary of this Chl fluorescence t
ransient discovery and of the 100th birth anniversary of Hans Kautsky
in 1991.