DISPERSAL BY THE WIND 65 
We have already noted the three great locomotive 
agents of Nature—wind, water, and the animal world— 
and we shall find that all of them are operative in the 
great work of seed dispersal. I will give a few 
instances of each which can be verified with very 
little trouble. 
(b) Dispersal by the Wind 
The plants whose seeds are helped along by the 
wind are legion, and every one knows the flying fruits 
containing one seed apiece of 
7 
the Dandelion, the Thistles, and A\e 
the Groundsel. Again, there are Zz IZ 



the seeds of the Willow Herb, “fe 
See en & pest as aweed i. 19 Seed of Willow 
in many gardens. Fruits and Herb. x 1k. 
seeds of this sort are provided 
with parachutes which enable them to float in the 
air while they are 
being blown about. 
Another device for 
catching the wind is 
the production of thin, 
flat, more or less disk- 
like seeds or fruits 
that are blown about 
almost as easily as 
confetti. Such fruits 
are to be found on 
Fic. 20. our Elm trees and 
A, Fruit of Birch, x 3; _B, seed of Yellow Birches, while flat 
Rattle, x 5; C, seed of Bee Orchis, x 80. 
seeds are produced 
by the Stock and the Wallflower, the Yellow Toad- 
flax and the Rattle. 

