XXIII. 

 MACHINERY OF THE CLAYS. 



" MATTER is infinitely divisible/' says the philosopher. 

 " Cultivation consists in pulveration," says Tull. " The 

 greater the comminution of the soil, that is, the ex- 

 posure of its internal superficies, the greater its power 

 to absorb Ammonia, the essence of manure, from 

 that great storehouse of fertility the atmosphere," 

 says the chemist. " Soils," says the geologist, " con- 

 sist of three elements, Clay, Sand, and Lime; the 

 more suitably they are inter-combined the more fer- 

 tile the resulting combination." 



This looks simple enough. Yet in the judicious 

 application of these few truths lie the great practical 

 problems of Husbandry ! All truth is simple : ' Sim- 

 plicity is the test of Truth.' Yet like the threo 

 primary colours, ' Red,' ' Yellow,' and ' Blue,' 

 bright, clear, and simple as they are to the eye, how 



