VARIATION IN COMPOSITION OF SAP FROM OUTER AND INNER 

 WOOD. 1893-1894. 



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. 



