Chapter IX 



169 



Uptake and Movement 





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More recently Ziegenspeck (1945) using fluorescent materials con- 

 firmed Strugger's results on water migration in the walls of parenchyma- 

 tous cells. 



Radioactive tracers. — While radioactive indicators have proven ex- 

 tremely useful in clarifying the path of mineral transport (Stout and 

 HoAGLAND, 1939), and while such tracers are being extensively used in 

 investigations on food manufacture and transport in plants, relatively few 

 experimenters have employed them in the study of the velocity of water 

 movement in the xylem. Huber (1932), together with his student Baum- 

 GARTNER (1934) uscd Thorium B in studying the movement of the xylem 

 contents in some conifers and in Sanchezia. Their results are given in 



