EVIDENCE OF HISTORY 251 



is another way of saying that the lime present 

 in the soil is always sufficient to overcome and 

 neutralize the acid effects due to decaying 

 vegetation. Here the farmers have their soils 

 "limed" continuously by the dust from the 

 highways. 



It seems evident that if the physical texture 

 of a given soil is favorable to the movement 

 of ground waters, that soil will be forever 

 "fed" from the inexhaustible storehouse that 

 Nature has provided. Limited, in a broad 

 sense, yes; but attempts to sound the day of 

 doom seem as futile as trying to empty the 

 boundless ocean with a tin cup. 



"The soil is the one indestructible immutable 

 asset of the Nation. It is the one resource 

 that cannot be exhausted; that cannot be used 

 up. It may be impaired by abuse, but not 

 destroyed." 



The logical extension of the theory of "im- 

 mutable assets" is that all soils are equally 

 fertile. This is true, in a general way, on 

 normal soils, soils of a texture which is ac- 

 cepted as necessary in farming practice. It 

 is easy enough to note exceptions without end. 

 These exceptions only go to prove the truth 

 of the theory, as the trite saying runs. 



