stopped on April 12, at the beginning of another rainy period 

 lasting four days. No precise weather observations were taken 

 because of a lack of suitable instruments, at the time, in the 

 meteorological department. 



Such weather, with wind and rain, not only interfered with 

 the regular flow of sap, but on two or three occasions spoiled 

 the samples. 



The dates upon which sap was collected and sampled are given 

 in Table 1, together with the weights of sap and percentage of 

 sugar (saccharose), and the weights of sugar calculated from 

 them. The relations existing between the results are more 

 plainly shown by the diagram. 



The rate of flow was very irregular and in most cases the per- 

 centage of sugar fell when the quantity of sap increased and 

 rose when it decreased. The variations in quality were so small, 

 however, that the weights of sugar followed the weights of sap 

 quite regularly. The percentage of sugar gradually fell from the 

 beginning of the season until toward the close, when there was 

 a rise. A similar variation was observed to exist in the results 

 from eleven out of thirteen trees, reported in Bulletin 5 of the 

 Division of Chemistry, U. S. Department of Agriculture. 



