106 GLANDULAR HAIRS 



of the outer wall (Fig. 50, B), so that after solution of the oil 

 by means of alcohol a space is evident beneath the cuticle. The 

 volatile oils produced by these glands are the cause of the fra- 

 grant perfume of many herbs (e.g. Lavender), and in some cases 

 play a part in the reduction of transpiration (cf . p. 64) or render 

 the plants distasteful to animals. 



