184 THE BEHAVIOUR OF PLANTS 
then they leave in the cloth countless tiny hooks, which 
are even harder to remove. 
If you wish to know more about these ‘ dead-beats ”’ 
who ride all over the country and never pay a penny of 
fare, go out for a tramp in the autumn in old neglected 
fields or in low waste ground. You can 
carry some home for study. Hxamine 
them to see the different kinds of seeds, 
and how the barbs, hooks, and other hold- 
fasts are formed. What animals do you 

FiG.225, Fruitof think would be of service to the plant in 
me dispersing such seeds? You may wish, 
also, to visit the same places in summer to see the 
plants in flower. 
Have you seen any other seeds than these described 
here which have means for dispersal? Do seeds ever 
float on the water and become scattered in this way? 
How is it with the cocoanut palm? Do seeds of 
grasses or weeds float in the water of lakes, ponds, 
rivers, and small streams ? 
