640 CONSERVATIVE ORGANS. [LECT. XI. 



in which case it is usually awl-shaped, and the 

 articulations are shorter towards the base, as in 

 White Bryony, Bryonia alba (Plate 9, fig." 11): 

 it does not always, however, terminate in a point, 

 but sometimes in a small knob, as on the newly 

 evolved, succulent shoots of ligneous plants, on 

 Belladonna, &c. (ib. fig. 12). In some instances^ 

 also, as on the under disk of the leaves of Com- 

 frey, Symphytum officinale, and Agrimony, Agri- 

 monia Eupatoria, the simple hair is hooked 

 towards its apex (ib. fig. 13, 14) ; which occa- 

 sions the velvety feeling when the finger is passed 

 over the surface of these leaves, the convex part 

 of the curve of the hair being that only which 

 comes in contact with the finger. Another va- 

 riety of the simple hair, necessary to be no- 

 ticed, is that which has given rise to the term 

 glanduloso-ciliata. It is a slender hollow thread 

 supporting a small, cup-shaped, glandular body; 

 and is rather to be regarded as a stipitate gland, 

 under which name I have already noticed it, than 

 as a hair. 



2. The compound hair (Pilus compositus) is 

 either feathery (plumosus), which is a simple hair 

 with other hairs attached to it laterally, as in 

 wave-leaved Hawkweed, Hieracium undulatum ; or 

 it is branched (ramosus), that is, lateral hairs are 

 given off from common stalks, as on the petiole of 

 the Gooseberry leaf; or it consists of an erect, 



2 



