194 SOME RECENT RESEARCHES IN PLANT PHYSIOLOGY 



line is the graph for the concentration of the sap of the 

 wood of the stem ; the full line that of the root. The figure 

 shown on p. 193 is fairly typical of the behaviour of 

 Populus, Fagus, and Salix. 



TABLE LI. 



Ilex aquifdium : WOOD SAP FROM STEM AT 1 -METRE LEVEL, 



AND FROM ROOT. 



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



FIG. 23. 



The results obtained with the evergreen Ilex differed 

 very considerably from those afforded by deciduous trees. 



