VARIATION IN COMPOSITION OF SAP FROM OUTER AND INNER 



WOOD. 1893-1894. 



o. Large rock maple in an open 

 field. Tapped by boring' a hole 

 1" in diameter and Ik" deep, 

 and continuing the tapping 

 with a h" hole, 2" in depth 



p. Small rock maple growing in 

 a wood. Tapped as above 



r. Tall maple in a group of trees 

 in open field; 12" in diameter. 

 Tapped with hole 13-16" diam- 

 eter and 2J" depth, continued 

 by a hole 6-16 ' diameter and 

 2|" depth 



. Rock maple in grove on south 

 slope of a low hill. Diameter 

 about 12" 



2.45 



2.08 

 2.00 

 2.10 



2.66 

 2.64 

 2.58 

 2.55 



1.99 

 1.86 

 1.93 



2.53 



2.25 

 2.17 

 2.30 



2.81 

 2.80 

 2.74 

 2.65 



2.07 

 1.91 

 1.98 



1.98 



1.92 

 1.85 

 1.75 



1.90 

 2.36 

 2.05 

 1.86 



1.48 

 1.45 

 1.51 



2.13 

 1.93 

 1.94 



2.04 

 2.45 

 2.13 

 1.95 



1.54 

 1.56 

 1.59 



The variations in richness of sap due to the manner of tap- 

 ping, have not yet been found sufficiently wide to justify any 

 method which will lessen the flow of sap. By comparing the 

 variations in composition with those of sap-flow given in Bulle- 

 tin 24, it will be noticed that the methods giving the richest 

 saps yielded the least in quantity. 



