THE FUNCTIONS OF THE WOOD 



193 



maltose, being a reducing sugar, contributes to the pre- 

 cipitate observed before inversion. It is somewhat hydro- 

 lyzed by boiling with acid for a short time, and conse- 

 quently adds to the precipitate occurring after inversion. 



JAN. FEB. MAR. APRIL MAY JUNE JULY AUG. SEPT. OCT. NOV. DEC. 



FIG. 22. 



Its presence renders the identification of a hexose by the 

 reduction test rather doubtful. 



An asterisk is placed on the date at which the leaves of 

 the buds began to expand. 



These observations are graphically recorded in Fig. 22, 

 in which the ordinates represent the depressions of freezing- 

 point and the abscissae the months of the year. The broken 



13 



