5, NORFOLK. ^3 



In the open air, it breaks Into fmall fquares ; 

 and mixes freely with the foiU 



In water ^ it falls readil)'' •, but dijfokes not. 



In the fire t it burns to brick *. 



In the add of fea-falt, part of it is diffolved ; 

 but the major part is indilToluble. Of one' 

 hundred grains, forly-three grains, only, pafs 

 through the filter ; leaving a refiduum of 

 iifty-feven grains; fifty grains of which is an 

 impalpable clay-like matter; the remaining 

 feven grains palpable ; chiefly fand ; but mixed 

 with fome beautifully-coloured granules and 

 fragments. 



A folution of fait of tartar precipitates 

 the whole of the diflbluble matter ; which falls 

 of a pure white ; but dries to a fomewhat yel- 

 lowifh powder ; which in burning lofes exadlly 

 five-twelfths of its weight ; and concretes into 

 a mafs of fulphtir-coloured lime : Vv'hich being 



* A piece weighing fifty-two grains was kept in a 

 flrong fire more than two hours. Its colour was changed 

 to "xfamt-reJ^ or flefh-colour ; its contexture to that of a 

 Jiard-burnt brick, unchangeable in water ; its weight forty- 

 grains. Being pulverized and faturated with the acid, the 

 filtered liquor aftbrdcd, by an addition of the alkali, -xgrey- 

 coloureJ mucilage, which fell reluctantly, r.nd dried to 9 

 pale cinnamon-coloured fubftancc. 



C 4 again 



