48 



SOILS AND PLANT LIFE 



light enough to float. It is not easy for water to enter 

 seeds of this class, but many of them will grow even after 

 being water-soaked. 



Those seeds that are scattered by animals may be 

 divided into three groups : (1) those which cling by means 

 of hooks or spines to the fur, hair or bodies of animals ; 

 (2) those which have food stored within or around them, 



15.- 



- Seeds scattered by animals. Note the Cockleburs in the 

 fur of the colUe. 



and which the birds and other animals carry some dis- 

 tance and drop ; and (3) those which the animals eat 

 and' which pass uninjured through the digestive tract. 



Some seeds, as those of the squirting cucumber, are 



■ thrown some distance from the parent plant by the pod, 



itself, much as we snap a fresh cherry pit between our 



thumb and finger. When the pods of some other plants 



such as the yellow oxalis, become dry, they snap the seed 



