INTRODUCTORY NOTE 



How many pits are to be seen in the cross -field and do they 

 occupy much or little of the space (see figs. 4-6 and p. 37)? 



Are there any resin-cells present and can they be seen as darkish 

 bands in the solid wood in transverse section? Have the vertical 

 tracheids spiral thickenings? 



Are there any tracheids in the rays (radial section)? 



Is the epithelium of the resin-canals of thin or thick-walled cells? 



Is the wood odourless or fragrant? 



(b) If a Broad-leaf (see p. 3) : 



Is there a pore-ring? 



Is the pore-ring of two or more rows of vessels or is it of a single 

 row? Is the single row crowded or scantily provided with pores ? 

 Are the pores made more evident by light coloured tissue packed 

 between them? 



How are the pores of the autumn wood arranged? 



Are large and small rays both present? 



Are the large rays many-rowed (multiseriate), or aggregate 

 (i.e. composed of many smaller rays as in a bunch)? 



If small, are the rays still visible with the unaided eye.? 



Are there uniseriate as well as multiseriate rays present? 



Are the large rays evenly distributed in transverse section or are 

 they in patches, or casual in their occurrence? 



Are the rays bright or dull in any section? 



If the wood is diffuse-porous, are the pores widely isolated or 

 apparently crowded as seen with the lens? 



Do the pores diminish in size or numbers from the inner to the 

 outer side of the ring? 



Is this a sudden or gradual diminution in size of the pores from 

 within outwards? 



If the pores be crowded, is there any arrangement to be discerned 

 at any point where they thin out? 



Is the parenchyma visible (with eye or lens)? Is it in close con- 

 nection with the pores (vasicentric " a "), or is it independent of 

 the pores and concentric in direction (" b ")? Are both "a" and 

 "b" present? 



What is the colour of the silver-grain and how much of the surface 

 of the wood does it cover? 



