the two groups and the nearly equal flow from all, with the 

 exception of tree 19, it seems certain that little was gained in 

 this case by tapping in the manner described. This is the 

 result of a single trial, but if we remember that sugar makers 

 have gradually changed from the use of the two-inch auger to 

 the half and three eighths-inch bit for tapping, on the ground 

 that they obtain nearly or quite as much sap with much less 

 injury to the tree, is it not reasonable to expect that holes three 

 or four inches apart should influence the flow from each other ? 

 This point has been referred to in connection with tree T, 

 Table 3. More sap may frequently be obtained by this method 

 of double tapping but the question arises whether, if we are 

 able to tap a tree two or more times, it is not true economy to 

 place the holes as far apart as possible, even if extra buckets 

 are required for so doing. 



