[10] 91 FLOWERING PLANTS 



Woody (Arboreal) Stems (continued). 



E. Make a diagrammatic sketch of the different faces of the block of Oak, including : (i) the transverse 

 secticn shewing the annual rings, the large spring-vessels, which appear as small holes in the wood, the broad 

 medullary rays crossing the line of cambium, inner bark (yellow-brown) consisting of secondary phloem and outer 

 bark (red) with irregular bands of dark cork ; (ii) radial face, shewing the wood and broad medullary rays 

 (' silver grain ') ; (iii) tangential face, shewing the ends of the medullary rays as seen in the cut surface of 

 the wood. 



Note on the transverse and radial faces the distinction between sapwood and heartwood. 



