THE SEQUOIA 



p I Z J c.c. U 



Diagram of rHE Structure of the Stem of an Ex i 'eei oi Three 



Yl AKS' ( .ROW I If 



Modified from a cut in " Encyclopedia Britannica" 

 p, pith; cc, Cambium cells; b, bark ; i, j, 3, growth of wood during first, second and third year. 



2 inches in diameter, measured inside the bark, which in pi 

 is nearly a foot in thicknes 



The Big Tree, like most trees of temperate climates, is ex- 

 ogenous, as is indicated by the concentric circles of wood beauti- 

 fully shown in this specimen. 



A r ection of the stem of any exogenous tree of one 



growth consists of three distinct areas or zones. In the 



center is the pith, ar< >und this a ring < >f wo< >d, and sum lUnding the 



whole the bark. Bach of these layers consists of cells which 



variously modified to carry on their respective functions. Uniting 



d the wood are delicate thin-walled cells, filled with 



protoplasm and nutrient matter, which constitute the 



tii of tl The inner- lis of this Cambium lo 



died, form the new wood, while- the on the 



bark. The old- • that neai pith, while the 



ark forms tl rior of the trunk During the spring. 



multiplication of Cambium 

 uently mon ind bark are laid down 



7 



