TEE WORK OF LEAVES 223 



wood, Ragweed, Boneset, etc.)- There can, therefore, 

 be no doubt of the efficiency of this kind of protection. 



(c) Woody, leathery texture, as in Rushes (or flinty, 

 as in Horse-tails) , is a means of protecting many plants, 

 a fact which is familiar to all. 



{d) Hugging the ground is a very successful device 

 employed by plants, such as Knot-grass, Cinquefoil, 

 Purslane ("Pusley"), Wild Strawberry, etc. 



