490 



TRANSLOCATION OF SOLUTES 



experiments in which the water jacket was rinsed out once each day with dis- 

 tilled water was essentially the same as in those experiments in which this was 

 not done, indicating that translocation of solutes did not occur through the 

 water. 



M 



i 



\ 



J 



Fig. io8. Diagram to show (A) stem with phloem removed, (B) with xylem 

 removed, the cut portion of each stem being enclosed in a water jacket, (C) sectional 

 view of {B). Only the petioles of the leaves are shown. Redrawn from Curtis (i935)- 



The results of some of these experiments are presented in Table 45. In- 

 variably the stems in which the xylem was cut showed greater elongation than 

 those in which the phloem was cut, indicating that most of the upward 

 translocation of foods occurred through the phloem tissues. 



Shoot elongation is a somewhat indirect measure of translocation, but 

 the conclusions drawn from such observations were supported in a number of 



