Mance: Quarry Industry of Southern Indiana 127 



added to a clay soil it makes the soil more mellow. In fact, the 

 richer a soil is in limestone the more readily the soil crumbles and 

 the more readily can the rainwater percolate thru it. The cause 

 of the compactness of a clay soil is the fact that such soils are com- 

 posed of very small particles which fit very closely together. 

 Water passes between these particles with difficulty, but when the 



The result of the use of hmestone fertilizer on a field of clover on the farm of Perry 

 Blackburn at Oolitic, Tnd. The field was not entirely covered and the clover at the 

 left of the picture had no dressing. 



limestone is added, the lime cements a number of these small 

 particles together to form much larger composite granules, there- 

 by increasing also the size of the spaces between the granules. 

 When once thoroly dressed with crushed limestone a clay soil 

 will remain in a friable condition for a number of years, and the 



