48 TROPICAL AGRICULTURE CHAP, vi 



may be about the same ; but this, happily, in most instances 

 the agriculturist may control, for shelter belts of trees will 

 often convert an exposed and barren place into a thriving 

 plantation. 



Soil. The soil has a great influence on climate, the tempera- 



ture for instance of countries, whose surface is covered with 

 sand, being much higher than the temperature of those in 

 Sandy which it consists of clay. In the sandy districts of Egypt, 

 usually hot. Bengal, Arabia, and other parts of the world where sandy 

 deserts exist, the heat is intolerable in certain seasons of 

 the year 



