HAIRS. 183 
panded in a head-like form, the formation of daughter cells 
frequently occurs, with the simultaneous secretion (for instance, 
Fie. 93 b, 
Fic. 93 a,—Stinging hair of the nettle, with a small head. The protoplasm of the hair 
circulating in currents (the direction of the currents indicated by arrows). 
Fic. 93 6,—Hairs of the epidermis of Nwa vomica (Berg). 
in the Labiate) of a balsam or volatile oil, which is often 
accompanied by the formation of mucilage’ (Figs. 96, 129, 
1The morphology and the nature of the development of secreting 
