2o8 NUTRITION 



the process by putting the cut end of a branch in a coloured 

 watery solution (say of eosin). The colour gradually passes up 

 the wood, and finally extends along the nerves of the leaves : 

 thus showing that the colouring-matter travels up the wood 

 with the water in which it is dissolved. If the branch has no 

 general woody body, but possesses separate strings (vascular 

 bundles) of woody tissue, the water and colouring - matter 

 will travel up the isolated bundles. 



