﻿FUMIGATION STUDIESJII 245 



2. Marked tents offer the only possible means kU'OZi.>n to us for correct 

 estimating, as has been shown by Morrill and IVogimn. 



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

 taken to shape them up as symmetrically as possible after tliey are placed on 

 the tree. 



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

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

 and effective zvork. 



Figure 105. Trees easy to tent but carelessly covered 



