CULTIVATION OP TIMBER. 301 



ing. My timber has mostly been left to nature's pruning, 

 though I have assisted some. From my limited experience I 

 think it better, where trees are planted expressly for timber, 

 to keep them trimmed up half or two-thirds the length of 

 the tree. 



Of course the thinning must begin sooner with thick than 

 with wide planting. But on this subject no definite rules can 

 be given as to time. As soon as they begin to crowd and over- 

 shadow each other, the thinning should begin, and be contin- 

 ued from time to time as circumstances require and judgment 

 dictates. 



