.XERol'HYTE SnCIHTIKS 



195 



the jiower of indepemlent motion, or the whole leaf may 

 move. If there is danger from exposure to drouth, some 

 of the leaflets will be observed to fold totretlier ; in case 







i- !(.. i; ^. A li(_-atli plant iErlca). showing low, bushy growili uwl sinail j*-:ivl'9. 



the danger is prolonged, more leaflets will fold together ; 

 and if the danger joersists, the surface of exposure will be 

 still further reduced, until the whole plant may have its 

 leaves eompletel}- folded up. In this way the amount of 



