Ovendry weights, which were obtained before and after the burns, permitted calcula- 

 tion of the particle weight loss within the propagating flame front. Weight loss by 

 particle size class (n) was estimated at one location in each plot. Two 15-cm.-long 

 sample branches per size class were tagged and located in a 20- by 100-cm. area 1.5 m. 

 from the end of each plot. The fires were quickly extinguished using a water fog after 

 the rear of the propagating flame passed over the particles. 



Flame length and depth were measured on photographs of the fires' profiles taken 

 at 2-foot intervals along the plots. Flame length is the distance from the outermost 

 tip of the unbroken flame to the center of the flame base which lies at the top of the 

 fuel. Flame depth is the horizontal distance through the base of the flame from the 

 leading edge of the flame to a point at the rear where it tapers rapidly into a low 

 and often sporadically flaming region. 



9 



