30 



TILLEES OF THE GKOUND CHAP. 



the country to another because they have destroyed 

 the fertility in one place, and can grow no more 

 food. 



In the tropical parts of Africa, then, people are 



FIG. 9. African Woman pounding "Mealies" or 

 Indian Corn for Food. 



few in number ; they do not increase fast though 

 the land is so rich, and one reason for this is that 

 they do not know how to make a right use of their 

 land. They have had to wait for more civilised 

 people to teach them that. 



In all the cases which we have looked at, in the 



