174 ANALYSIS OF LITHOMARGE. 



The experiments taken fcparately gave 14.1 

 of argillaceous, and 5.7 of calcareous earth; but 

 this excefs of 3.8 feems to arife chiefly from the 

 imperfect drying of thefc fubftunces. 



S iv. Of tie Hampjbirc Earth. 



THIS earth is a native of the county of Hump- 

 fliire in England ; but, as the exportation of it 

 is prohibited, it cannot be procured in larger 

 quantities than are required for inineralogical 

 collections. Fullers huve long ufed it in their 

 trade, although in feveral manufactories in Eng- 

 land, the proccfg of fulling cloths is carried on 

 by treading them under feet with the dung of 

 f\vinc and warmed human urine. 



The colour of the Hamplhire earth is dark, a 

 little inclined to green, and faintly marked with 

 yellowish veins. Jn Jubilance it is opaque, and 

 appears in foine degree fl ratified, although it does 

 not feparate in llrata. As to hardnefs, it is not e- 

 qual to thofe already defcribed. Its particles 

 arc without fhape, but capable of being poiifh- 

 cd by the nail. Its fractures are rather rough, 

 with dark pointed eminencies. It has an earthy 

 fincil, but no tulle ; adheres to the lip; and be- 

 'tween the teeth feels a little filiceous. 



When immeried in water, it falls to pieces 

 like the other earth. Rubbing it in water pro- 

 duces 



