The variation in composition of sap from different sides of a 

 tree, lias not been found to be wide nor constant. Two trees 

 showed a decidedly higher percentage of sugar from the north 

 side, one tree gave the advantage to the south side, while a 

 fourth tree gave nearly equal percentages to both north and 

 south sides. 



COMPOSITION OF SAP FROM DIFFERENT SIDES OF A TREE, 1892 and 1893. 



It has been claimed that the outer wood of the maple yields a 

 richer sap than the inner wood. To test the correctness of this 

 opinion, tree 13 was tapped with two holes as near together as 

 possible ; one hole being bored diagonally in order to keep near 

 the bark, and the other bored toward the centre of the tree. 

 Each hole was bored to the same depth on the bit. The result 

 of this experiment was contrary to the above claim. Trees 8 



