84 A TREATISE ON THE CONNECTION OF 



NITRAT OF POTASH, OR SALT-PETRE, 



Is a salt very soluble, formed by the putrefaction 

 and complete decomposition of animal and vegetable sub- 

 stances, when mixed with calcareous matter and wood 

 ashes. It promotes vegetation, but its high price pre- 

 cludes its being used as an article of manure. 



NITRAT OF SODA, OR CUBIC NITRE. 



THIS salt is likewise very soluble, but seldom natu- 

 rally occurs. It is probable, that cubic nitre would pro- 

 mote vegetation in an equal degree with nitrat of pot- 

 ash or salt-petre. 



