A TREE PROPPING UP ITSELF. 141 
from the ground by a number of thick roots, 
which uphold the stem in the air: this curious 
THE SCREW-PINE. 
(The prop is seen at some height above the other roots.) 
structure naturally makes the tree less able to 
resist the strong efforts of the wind to throw it 
down; and, wonderful to say, the tree seems to 
