242 AUTUMNAL LEAVES. 



be on the top of the right-hand side of the leaflet 

 or at the bottom of the same side : or the new 

 colouring may begin on the opposite side. Two 

 or three parts of leaflets may be thus though 

 never uniformly affected by the autumn colour- 

 ing, whilst the others remain green and unaltered. 

 The top of one leaflet and the base or sides of 

 another may be tinted at the same time, though 

 never in the same way. From their normal 

 green the principal veinlets themselves will turn 

 to russet or to brown, and a very beautiful contrast 

 is afforded when the embrowned veins are sur- 

 rounded by lines of deep green tissue. Often- 

 times when the parallel veins themselves are 

 russet or brown and nearly the whole surface of 

 leaf including the venules in the spaces be- 

 tween them are also thus coloured, lines of tissue 

 along on either side of the parallel veins will 

 remain green, giving an appearance as of green 

 stripes arranged diagonally, along on either side 

 of the mid-vein. Russet spots will not unfre- 

 quently appear at the top, at the side or at the 

 bottom of the leaflets upon the pervading golden 

 brown, and at other times the same leaflet will 



