■rino STKL'CTL'UK nF \VUU]>. 



29 



some, as ash, the tracheitis are wanting; apjole and niapie have no 

 woody fiber, and oak and plmn no fibrous ceils. 



This recitai is enough to sliow that tlie wood of tlie broad-leaved 

 trees is much more complex in structure than that of the conifers. It 



57 DJAtlETERS 



PITH RAYS- 



CR055-5ECTWH "" o-Antms 





PITH RAYS 



• PORE 



RADiAL SECTION 

 37 DiAntTess 



RiriQ -POROUS WOOD (white ash) 



TORt 

 TAH6EMT1AL SECTIOM 



^7 OI^METtRi 



^ 



I'ig. 30. 



is by means of the number and distribution of tliese elements that 

 particular woods are identified microscopically. See p. 289. 



Bing-porous luoods. Looking thru the microscope at a cross-section 

 of ash, a ring-porous wood, Fig. 20 : 



(1) The large round or oval pores or vessels grouped mostly in 

 the spring wood first attract attention. Smaller ones, Ijut still quite 



