4 6 
THE GARDEN OF THE WORLD 
ivy has tendrils also, but at their tips the tendrils 
have sensitive disks which give off a sticky juice 
when rubbed against a support. This juice is 
like glue and fastens the tendril very tightly. 
Other plants—the trumpet vine, the poison 
ivy, and the English ivy—have aerial roots 
which attach themselves to the support. They 
like best to climb a brick or stone wall and these 
roots occupy the chinks or dark places of the 
wall or of the bark if they are climbing upon 
the trunk of a tree. 
Some plants just scramble up. The tall 
blackberry has hooks and prickles all over its 
stems and leaves which hold fast to any support 
they may happen to find. 
Climbers can get very high into the air with¬ 
out wasting effort in building strong stout 
trunks as trees do. They can get a great many 
leaves to the light and can grow very swiftly. 
Many of them have very long stems, from fifty 
to three hundred feet long. In the hot damp 
countries there are vines with stems as long as 
one thousand feet, which is nearly a fifth of a 
Climbers have 
different 
methods 
