334 



EXPERIMENTS WITS PLANTS 



185. Epidermis of Holly, with thick 

 cuticle (c). 



Sage Brush [Fig. 187], Mullein [Fig. 188], Five- 

 finger, Immortelle, coverings of many winter-buds), or 



varnish and resin (cover- 

 ings of most winter- buds 

 and many leaves when 

 young; Cistus, Pines. 

 etc.). 



(6) Eeduced evapora- 

 tion obtained by rolling 

 the leaves (Corn, 1 many 

 Grasses) or keeping them 

 in a vertical position (Eu- 

 calyptus, Iris) . 



(7) Storage of water 

 (and food) in thickened 

 leaves (Live-for-ever, Cen- 

 tury Plant, Hen-and-chick- 

 ens) , or in thickened stems 



186. Waxy covering of Sugar Cane (in the (Cacti, Fig. 182, etc.). 

 form of rod-like outgrowths). 



187. Hairs of Wormwood or Sage-brush. 



are tempting to many 

 animals, hence the 

 Cacti are protected 

 by sharp spines. The 

 Century Plant is pro- 

 tected by the sharp 

 points of its leaves: 



1 See page 213. 



