314 



Bulletin 256. 



To avoid impositions, it is only necessary to establish the 

 standard by employing as pruners only individuals with reputa- 

 tions well established, or with recommendations from competent 



men. 



(j.) Construction work. 



The injuries which trees re- 

 ceive because they are located 

 in the neighborhood of con- 

 struction work or because they 

 are in the path of buildings 

 which are being moved, present 

 another serious problem to all 

 municipal governments (Fig. 

 229). Trees are thus mutilated 

 in a number of ways as : by the 

 moving of btiildings, being used 

 as supports for guy wires, pil- 

 ing building materials against 

 the trunk, and regrading around 

 the base of the trees. All of 

 these dangers must be guarded 

 against if trees so located are 

 to be preserved. The piling of 

 brick, lumber, and stone slabs 

 close against the trunk may 

 cause injuries which allow 

 decay to enter at that point. 

 Tying guy wires for the pur- 

 pose of supporting derricks or 

 telephone poles (Fig. 230), is a 

 common practice, and will cause 

 no injury to the tree if properly 

 done. It is done so often with- 

 out protecting the tree, how- 

 ever, that serious injur}" results 

 (Fig. 231). The correct method of attaching a wire of this kind to a 

 tree is to place a number of -small strips of board against the trunk, 

 parallel to its axis, and then bring the pressure of the wires to bear 

 directly on these (Fig. 233). If the trunk is forked, the wire may be 

 carried between the branches near the crotch and attached to a cross 

 piece which, being placed transversely to the axis of the two branches, 



Fig. 230. A frequent method of attaching 

 guy-wires to street trees, and one which 

 should not be permitted. 



