ON THE PROTECTION OF BUDS 



91 



face, besmearing the bud as in the Horse Chestnut, but 

 only in the very early stages. As the bud swells the outer 

 cap becomes ruptured, and appears then like a deeply 

 concave scale, which is gla- 

 brous, or nearly so. This 

 is followed by others, which 

 attain a somewhat larger 

 size before the expanding 

 bud causes them to split ; 

 they are densely covered 

 with brown hairs exter- 

 nally and glabrous inter- 

 nally. 



In the Horse Chestnut 

 the fur is on the young 

 leaves themselves. In this 

 species, as in many others, 

 the hairs drop off when the 

 leaf expands and their func- 

 tion is fulfilled. 



Virgilia lutea and Gym- 

 nocladus, both members of Leguminosce, and Pterocarya, 

 an ally of the Walnut, may be mentioned as other cases 

 in which the bud is well protected by furry hairs. 



Protection by Stiff Hairs 



In many cases, as, for instance, in the common 

 Stachys (8. sylvatica) (fig. 6, p. 5) and its allies, the bud 

 is protected by stiff hairs. 



FIG. 136. OPENING SHOOT OF 

 PLANE. Two-thirds nat. size. 



L , I/', successive leaves with their 

 stipules, St\ ,ST-. 



