THE STKUCTURE OF WOOD. 



27 



"S^'^ 





(summer ;*_2:'iti*' 



.i^ ^^PITH RAY5- 

 37 DIAMETERS (-[^Qjj 5ECTI0I1 '»' """"STERS 



^0^ SPRiHS WOOD R/^PIAL 5ECTI0n 



yi OlAMtTERi 



196 DI/V1ETEH5 



37 DIAHETERS T-Art6E«TIAL SECTIOM. '^* flAflETERS 



nori-POKOU5 wood (white PIME^ 



Fig-. 18. 



