MACROSCOPIC STRFCTTRE. 



25 



5. The Street Chestnut (Castmiea). 

 (America, Asia and Europe.) 



Transverse Section. Vessels somewhat larger and more 

 numerous in the spring-wood ; in summer-wood often 

 arranged in radial, bifurcating rows, as in oakwood, and, 

 owing to their being surrounded by pale parenchyma, 



^ 







. Type of Sweet Chestnut 

 Wood (Castanea). 



Fi<j-. !.">. Type of Robinia Wood 

 (Robinia). 



they appear as whitish forked lines in the darker mass. 

 The medullary rays are scarcely visible. 



Radial Section. The annual rings are distinct, owing to 

 the sections of the vessels ; the medullary rays are faintly 

 incognizable as short, bright portions of bands. 



Tangential Section. The vessels and annual rings as in 

 the radiiil section (showing five years' growth in Fig. 14). 



