_ sa - ASCENT OF SAP. 



12. Path of water and dissolved substances absorbed by the root. 



(a) A transverse section of a cut stem, the lower end of which has been immersed 

 in a coloured solution. Note in which tissue the colour has ascended. 



(6) Rich distribution of xylem vessels seen in a leaf which has been cleared in 

 chloral hydrate. 



(c) A specimen of mistletoe, a partial parasite which obtains its water and 

 dissolved salts by a junction of its xylem with that of its host. 



13. Demonstration of root-pressure. 



14. Capillarity. 



(a) Ascent of a coloured solution in capillary glass tubes. Compare the heights 



reached in broader and in narrower tubes. 

 (6) Ascent of a coloured solution in the vascular bundles of a maize leaf. 



