320 AUTUMNAL LEAVES. 



autumn tinting to that of the "Willow we have 

 described and figured. The principal veins 

 sweep upwards from the mid-vein, in curves, to- 

 wards the margins on either side and are very 

 prominently shown on the under side. Across 

 these, smaller veins run enclosing tissue which is 

 traversed by a fine network of venules. The 

 final colour of the Alder Buckthorn is a deep 

 yellow, or orange; and these tints, commencing 

 sometimes upon the edges of the leaves, some- 

 times at their tops and sometimes on either side, 

 will advance upon the normal hue in an almost 

 endless variety of ways, giving occasion for many 

 beautiful effects of contrast. 



