68 *fhe Principles of Part IL 



and hollow; keeps it dry; and, as the 

 farmers exprefs it, fweetens the foil. The 

 foft un&uous kind is thought the befL 

 Farmers think that it exhaufts the foil 

 very much; and therefore they generally 

 advife dung to be laid on along with it. 

 Lime-ftone gravel is much ufed in Ireland 

 as a manure. 



THESE calcarious bodies are not difTol- 

 vable in any way but by acids. With thefc 

 a great efFervefcence Jiappens, a folution 

 of the calcarious body is made, and a neu- 

 tral fait is formed from that conjunction. 

 This neutral fait is always foluble in water,, 

 unlefs where the acid of vitriol is ufed. 



THESE calcarious ftones, when burnt in 

 a ftrong fire, turn to quick-lime, a body 

 much ufed in farming. It attrads acids 

 much more than it did before, and is now 

 in a fmall degree foluble in water, without 

 their afiiftance. It is not, however, on thefe 

 foluble parts that its frudifying power 



depends ; 



