FUMIGATION STUDlES.llI 



245 



2. Marked tents offer the only possible vieans known to us for correct 

 estimating, as has been shown by Morrill and Woglum. 



3. Marked tents are an advance over old methods only when care is 

 taken to slmpe them up as symmetrically as possible after they are placed on 

 the tree. 



4. Close estimates should be made on every tree separately, but a 

 good generous margin over this should be allowed so as to be sure of thorough 

 and effective ivork. 



Figure 105. Trees easy to tent but carelessly covered 



