A TREATISE ON THE CONNECTION OF 



SULPHAT OF IRON, OR GREEN VITRIOL. 



' 

 THIS salt is formed naturally, in many places in great 



abundance, by the process of oxygenation, from sulphu- 

 reous or pyriteous substances. These matters are gene- 

 rally found accompanying the coal strata, as well as in 

 coal itself; particularly in such coals as are sulphureous. 

 This salt is very soluble in water, and is in a high de- 

 gree injurious to vegetation, when it abounds in soils 

 consisting of poor clay and siliceous matter, without any 



admixture of vegetable or calcareous substances. 



It is decomposed by alkaline salts, forming therewith 

 vitriolated tantar, Glauber salt, vitriolic ammoniac, gypsum, 

 and Epsom salt. When added to soils containing calcareous 

 matter, and a due proportion of animal and vegetable sub- 

 stances, it has been found, when - not used in too great 

 quantities, to have producect beneficial efFefts in promoting 

 the growth of grass ; but experiments have not as yet 

 been made, fully to ascertain its effefts on arable land. 



NITRAT 



