UPWARD TRANSLOCATIOxN OF MINERAL SALTS 493 



TABLE 46 INORGANIC CONSTITUENTS IN THE TRACHEAL SAP OF BARTLETT PEAR AND IN 



THE SOIL EXTRACT (dATA OF ANDERSSEN, I929) 



5600 



JUN. JUL. AUG. SEP. OCT. NOV. DEC. JAN. FEB. MAR. APR. MAY 



t t 



LEAVES SHED FULL BLOOM 



Fig. 109. Seasonal variations in the specific resistance of the xylem sap of pear. Data 



of Anderssen (1929). 



