,MERISTKM. 



47 



of the cell-wall and the absorption of food materials apply equally 

 to cambium as to other rapidly-dividing young tissues ; and it 

 will be seen that the change from the typical thin-walled cambial 

 cell to the ^modified elements met with in the wood and bast is 

 often a very rapid one. 



jixy. 



Fig. 29.— Portion' or a Transversk (Section near the Apex of a Vounc 

 tiHOOT OF Pinus. — e, Epidermis ; k, peribleni (rudimentary cortex) ; 

 .r, rudimentary cambium ; puy, protox3'lem ; pph, protophloem ; 

 m, medulla ; / , resin-canals. 



Fig. .30. — Diagram illustbatino the Arrangement of Primary and 

 Secondary Vascular Tissues in a Dicotyledonous (or Coniferous) 

 Stem. (A transverse section near the apex of a young stem.) — 

 e, Epidermis ; /, fundamental or ground-tissue ; pc, procambial 

 strands, inner parts protoxylem, outer parts protophloem ; x, meri- 

 stem zone (cambium) of a procambial strand ; ifc, dotted circle 

 indicating the position where the interfascicular cambium will arise. 



