The i^ inch holes yielded 89.5 pounds of sap, while the 3^^ 

 inch holes gave a little more than double that amount, or 187 

 pounds. 



In 1893, tree 8 was tapped twice, one hole being i}( inch 

 deep, and the other 2^2 inches. Tree 9 was tapped 231- inciics 

 deep, and tree 10 i^ inches. These trees were large, thrifty, 

 shade trees. The rate of flow was determined by noting the 

 amount of sap that flowed in two minutes, and in Table 2 this 

 amount is expressed in cubic centimeters. 



April 9th, the i}( inch holes were deepened to 2^2 inches, 

 the rate of tiow being taken jus*- before and after the deepening. 



TABLE 2.— RELATION OF DEPTH OF TAPPING TO FLOW OF SAP. 



1€93. 



Time. 



Tree 8. 



Tree 9. 



1't inch. 



2A inch. 



2^ inch. 



Tree 10. 



1' inch. 



March 14 ll:30a.m. 



14 3:C0p.m. 



21 10:00 a.m. 



22 : 3:00 D.m. 



2.'^ ] 10:00 a. ni. 



2" ' 3:C0p.ii!. 



27 10:00 a.m. 



27 2:00 p m. 



2 3:C0p.m. 



April b Ii:t0a. m. 



Av. 



April 



Av. 



9 



11 



11 



12 



20...- 



rale before 



9 



rate afti, r 



UrOOa.m. 

 10:30 a. m. 



3:00 p.m. 



9:S0a.m. 

 llrCOa.m. 



11:00 a.m. 



April 9 ll:00a.m. 



15.0 CO. 

 6.0 " 

 6.0 " 

 7.0 " 

 4.0 " 

 3.0 " 

 2.0 " 



16 " 



15.0 " 



7.0 " 



Deepened 



to 2i in. 



21.0 CO. 



140 " 

 6.0 " 



31.0 " 

 9.0 " 



8.4 " 



16.2 " 



26.0 e.c. 



120 " 



6.5 " 



12.0 •• 



7.0 " 



5.5 '• 



6.0 " 



26.0 " 



18.0 " 



24.0 " 



22.0 

 17.0 

 7.0 

 37.0 

 17.0 



14.0 

 20.0 



In this trial, the deepening of the i}( inch holes brought the 

 rate of How from these holes nearly to an equality with that 

 from the holes originally 2}^ inches deep. The increase is 

 especially noticeable if a comparison is made between the rates 

 of fiow just before and after deepening. 



April 17th, a tree about 12 inches in diameter was tapped 2 

 inches deep with a i inch bit, the hole was then bored 2 inches 

 deeper with a }4 inch bit. An iron spout was driven into the 



