SOIL 



85 



43, Soil. Experiment 46. Into a 16 oz. bottle nearly full of 

 water put a small handful of sand, and into another bottle about the 

 same amount of pulverized clay. Shake each bottle thoroughly and 

 allow the water to settle. Which settles the more rapidly? Which 

 would settle first if washed by a stream whose current was gradually 

 checked? 



Wherever the inclination is not too steep, we find the 

 surface of the bed rocks covered for varying depths with 

 a loose material which we call soil. It is upon this that 

 plants grow and in it lies the wealth of our agricultural 

 communities. On examining this soil, it will be found 

 that in some places it grows coarser and coarser the far- 



m 



LOCAL SOIL. 

 This soil is being weathered from the underlying rock. 



ther down we dig. The coarser the pieces become, the 

 more they resemble the bed rock, until finally they pass 



