Fin. 26. Cambium andcjrtex of oak, at the end of the first year. We have (i) cork- 

 cells (A"), formed from the cork-cambium (C.Ca): the cells developed on the 

 inside of the latter (Cl) are termed collenchyma. and add to the cortex. (2) The 

 conex proper, cmsis'.ing of parenchyma-cells (pa), some of which contain crystals. 

 () The inner or secondary cortex ( termed phloem or bast), developed chiefly by 

 the activity of the cambium (Co) '. this phloem consists of hard bnst fibres (hb), 

 sieve-tubes (S), and cells (c), and is added to internally by the cambium (Ca) each 

 year. It is also traversed by medullary-rays (Mr), which are continuations of 

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

 where the new cork-cambium will be developed. 



