1 66 LITTLE-KNOWN PLANTS 



PRACTICAL EXERCISES 



1. For study obtain samples of the plants mentioned in 

 the lesson. Procure samples of crude rubber. 



2. Make a cut in the bark, leaf, or fruit of the Osage orange 

 tree. The milky sap that flows from the wound closely re- 

 sembles the sap of rubber trees. The rubber trees and the Osage 

 orange tree belong to the same family. 



