THE FARM, AND OUR FOOD SUPPLIES 159 



3. Name regions of the world where little or no plant life 

 exists, and state briefly the reason for each such case. What 

 is true of animal life there? What food supplies are avail- 

 able there for men? What material is to be had there 

 (a) for dwellings ; (6) for clothing ? 



As an example of the usefulness of plants to man, gather by reading 

 and from all available sources as full information as possible of the 

 plants from which the crude rubber is obtained, the processes in- 

 volved in their cultivation, the harvest and preparation of this material 

 for market, and its processes of manufacture. 



4. Under appropriate headings, make lists of the various 

 manufactured articles into which rubber enters for use in 

 modern life. 



5. State very definitely the processes of rubber manu- 

 facture from the crude gum of the rubber fields. 



6. Tell briefly of the care and cultivation of the rubber 

 plantations, and of the general character of the regions that 

 are the chief sources of rubber supply. 



