TABLE 3.-RELATIOX OF DEPTH OF TAPPING TO FLOW OF SAP, 



R. 



1894. 



:'8 in. 

 Inner. 



13-16 in. 

 Outer. 



1 2 in. 

 Inner. 



U. 



!•; in. -^.s in. I :'k in. 1 H in. 

 Outer. 6 in. hole. 2 in. hole, h in. hole. 



Mar. 17. 

 " 24. 



" 26.. 

 " 29. 

 " 31.. 



Average | 



17.0 e. e. 

 18.0 " 

 4.0 " 

 15.0 " 



13.5 e. c. 



Although the rate of flow was taken but a few times in 1894, 

 the results are in each case, in accord with those of the preced- 

 ing years. 



The flow from the inner wood of tree R exceeded that from 

 the outer wood although the inner hole was less than half the 

 diameter of the outer hole. 



In S, with a hole of uniform diameter the flow from the inner 

 wood was almost double that from the outer. The remarkable 

 difference in the rate of flow from the 6 inch and 2 inch holes in 

 tree T, raises the question as to the efi^ect of a deep hole upon 

 the flow from a shallow one near it. A reference to table 2 

 shows that deepening the shallow hole in the tree 8, in 1893, at 

 once decreased slightly the flow from the deeper hole. The 

 rate of flow from tree U is of interest, as showing the rapid 

 flow from a deep, but small hole. A comparison of the rate of 

 flow from holes of nearly equal depth but of various diameters 

 is afforded by these four trees, as shown in table 3. 



The only conclusions that can possibly be drawn from the 

 result of these trials as shown in the three preceding tables, is 

 that the flow of sap is very largely dependent upon jhe depth of 



