THE STRUCTURE OF THE ROOT 



23 



longitudinal section through the horizontal runner of the 

 Liquorice. 



On the left are the narrow wood fibres tightly wedged 

 together (b), and adjoining a few layers of wood parenchyma 

 (Jqy). Then follows a thin pitted vessel {[/), with more wood 



Fig. 7.— Longitudinal Section thiiough a Runner of Glycyn-hiza glabra (Liquouice). 

 g, vessels with slit-like pits ; hp, wood parenchyma ; h, wood fibres {aft-er TsciiiRCH). 



parenchyma to the right of it. Still more to the right is a 

 large closed vessel {g), which is seen from the outside. Here 

 the thinner portions of the wall appear as somewhat spirally 

 arranged simple slit-like pits. How this appearance is formed 

 on the wall of the vessel we may gather from a glance at the 



