Fia 26 —Cambium and c:>rte\ of oak, at the end of the first year We have (i)cork 

 cells (JSf), formed from the cork cambium {C Ca) the cells developed on the 

 mside of the latter {Clj are termed collenchynia and add to the cortex (2) The 

 cortex proper, consis ing of parenchj mi-cells (/iz), some of which conta n cr^htals 

 {•\) The inner or secondary corte'? (ttrm^d j^khem or bast), de\ eloped chiefly b> 

 the activity of the cambium (Co) this phloem consists of hard bist fibres {hb), 

 sieve-tubes (^), and cells (<r), and is added to internally by the cambium (Cat) each 

 >ear It is also traversed by medullary rays (il/r), which are continuations of 

 those in the wood The dotted line (^) in the cortical parenchyma indicates 

 uhere the new cork-cambmm will be developed 



