^, NORFOLK, ar 



In the acid of fea-falt, the principal part of 

 it is dijfolved, and taken up by the acid ; leav- 

 ing a fmall proportion, of grofs earthy matter, 

 undilTolved. Of one hundred grains of this 

 marl, — pulverized, dried, weighed, mixed with 

 water, and faturated with this acid, — eighty- 

 five grains pafs through the filter ; leaving a 

 rcfidue of fifteen grains : two-thirds of which 

 is palpable, confifting chiefly of fand and 

 flint; one-third a fine impalpable clay-like 

 matter ; mixing freely with water ; — fome 

 part of it fubfiding with reluxftance, 



Afolutwn of fait of tartar,, add-ed to the fil- 

 tered liquor, precipitates the whole of the 

 diflTolved matter ; in a fnow-white powder : 

 which being retained two hours and a half in 

 a flrong fire, 1-ofes five-twelfths of its weight *, 

 and is concreted into a porous, friable ajh- 

 coloured mafs of quick-lime -, which being 

 re-fufpended in acid, and again precipitated, 

 regains the weight loft in the fire, and regains 

 lis fnowy whitenefs. 



* Thirty grains of the powder, perfectly dried, loft 

 fomewhat more than twelve grains and a half; the lime, 

 when taken out of the crucible, weighing fomewhat lefs 

 jhau fcvcutcen grains and a half. 



C 3 there- 



