Soil-Carriers 39 



western side of the mountains is bright and clear, but that 

 on the Limagne side is generally slightly hazy, and the 

 haze seems to consist of fine dust. And when we inquire 

 about the mountains, we find that they are extinct vol- 

 canoes, and are widely strewn with volcanic ashes, the 

 relics of ancient eruptions, rich in the minerals which 

 make the most fertile soils, and just in the condition in 

 which plants can most readily make use of them. 



QUESTIONS FOR REVIEW 



1. Describe the various ways by which the soil of Egypt is 

 made extraordinarily fertile. 



2, What important part does the beaver play in the work 

 of soil distribution? 



3. Give examples of the work of the wind in scattering soil. 



4, What curious condition of wind and soil exists in the 

 valley of the Limagne? 



