ADMINISTRATION 93 



tribution of the remaining trees. Measurements 

 taken at regular intervals show the precise effect of 

 the method used on each plot. Close observations 

 of the reproduction which takes place, brush and 

 other forms of cover which may establish themselves, 

 and changes in soil conditions are recorded. On 

 similar sample plots methods of brush disposal, 

 methods of marking timber for cutting, and thin- 

 ning methods are studied. After logging there are 

 several ways in which the resulting slash may be dis- 

 posed, depending upon surrounding conditions. 

 In some localities the brush must be burned imme- 

 diately on account of the fire danger which its pres- 

 ence involves; in other places it must be removed 

 because it interferes with reproduction; in still 

 other places the brush may be scattered over the 

 area because there is little fire danger and, in fact, 

 the brush has been found to assist and protect re- 

 production. All these possibilities must be deter- 

 mined by experiments. Likewise in marking tim- 

 ber for cutting and in thinning practice various 

 methods are possible, depending upon circum- 

 stances, the most important of which are the re- 

 quirements of the species and the density of the 

 forest. 



