i,niE. 10#f 



OF SALINE AND MINERAL MANURES. 



The last class of manures embracto those of a saline 

 and mineral character. These are numerous, but not 

 many of them have been as yet largely used in tliis 

 country. Beside those which are known here, I shall 

 mention a few of those that have been found most 

 ».fTi. :u lous abroad. 



SECTION IV. OF LIME. 



I will commence with a mineral manure, whose use 

 is most widely extended, in every country where agri- 

 culture has made much advance. I refer to lime. 



Lime is nrdinariiv found in the form of common 



contains aUnit 44 Um. ol cHrlxuiic aciii U[d8. lliis 

 may be driven off by a hi^h heat, as in the lime-kihis. 

 The lime then remains in what is called the caustic 

 state, or quicklime. It will bum the ton^e, if ap- 

 plied to it. When water is poured upon it (this may 

 be shown by teachers), it swells, cracks, heats, and 

 finally crumbles to a fine pnwdir. If the water is 

 only used in sufficient qu » 



will all disap{>ear, beint; • 

 fact united with the lime, ami 

 solid stone. The heat durin"^ 



chemical union of water .A ton of lim. - 



stone unites with alwut on.-n'min of a ton of Witter. 



If quicklime or slaked lime is exposed to the air. it 



acid, as the limestone did before it leti, thua 



proriog the fart ju!«t stated. 



