[from the text] A prescribed fire was set to bum approximately three-fourths of the forest floor depth in a ponderosa pine forest near Flagstaff, Arizona, in October 1964. The forest floor, by definition, is the accumulation of dead organic plant material on mineral soil. This objective of the prescribed fire generally was achieved (Davis et al. 1968). Other effects of the fire included the thinning of the forest overstory from below, an increase in the germination and initial survival of ponderosa pine seedlings, and a small increase in the production of herbaceous plants. A temporary reduction of fire hazard also was attained. The study described in this paper was conducted to analyze the effects of this fire through time after the burning, on those characteristics originally modified by the burn. In essence, this paper presents a case study of the effects of prescribed fire in a ponderosa pine forest, as evaluations of these effects were made 1 month, and 1, 2, 11, and 24 years after the fire. A partial insight into the future of prescribed burning in these forests also has been obtained from this study.