THE STUUCTURE OF WOOD. 



31 



In the radial section, Fig. 21 : 



(6) The pith rays are evident. In sycamore, Xo. 53, Cliap. Ill, 

 they are quite large. 



(7) The interweaving of the fibers is to be noted and also their 

 varietv. 



(r 



^ 



07 DiAMETTRa CRO55~5ECTI0ri '®^ diameters 



<^l1i 



PITH RAYS— ^A^-^ 



.,^-\n^'^}^ 



poncs 



RADIAL 5ECTI0n 

 37 piAnereRS 



"^Hmsv 



TAn6EriTlAL5ECT10M 



DirruSt- P0R0U5 wood aeuow poplar) 



J 



Fig-. 21. 



In the tangential section. Fig. 21 : 



(8) The grain is to be traced only dimly, but tlie fibers are seen 

 to run in waves around tlie pith ravs. 



(9) The pith rays, the ends of which are plainly visible. 



