FRIENDS AND ENEMIES 41 
the juice hardens and holds her so fast that 
she can never get away. 
The wild pink punishes crawling insects who 
try to steal nectar by catching them in a sticky 
juice smeared high on their stems. It holds 
them as fast as fly paper does. Perhaps you 
have noticed certain weeds that made your 
fingers sticky when you picked them. This is 
the reason for that stickiness. 
Some plants must protect themselves from ^ 
cattle who would eat their leaves before the 
season’s work is done. Roses and nearly all g 
plants of the Rose family have sharp thorns 
that give a sharp prick to any cow who tries to r 
take a mouthful. Wild parsnip which grows 
in the fields has a sour juice that causes the cattle 
to leave it alone. Some weeds have poisonous ^ 
leaves that make the cattle sick or kill them, if ^ 
eaten. Cattle soon learn to leave these plants 
alone and not to molest them. 
Did you ever look inside of a burr? If cut 
across with a sharp knife, the seeds are found 
inside. The parent plant must have those seeds 
Roses protect them¬ 
selves from crawlers 
