O F E A R T H S. -t 



*J J 



free from grittinefs. Dry, and fcraped, it fhews a glofTy polite 

 furface. It efFervefces with Aquafortis. In the fire it acquires a 

 brighter colour. It is a good manure for light hungry lands. 



An amen blue marie, with a flight admixture of a pale yellow, 

 is at Chillingham, but not plentifully. It is heavy, of a compact 

 texture, and unctuous to the touch. It makes an eafy folution 

 in water, and is of a fweet aftringent tafte, free from grittinefs. 

 Depurated, and worked into a pafte, it is ductile, and has a gloify 

 beautiful furface on being cut through with a knife. Applied to 

 the buds of coins and fygnets, it takes them off eafily, and mews 

 their beauties and defects with extraordinary exactnefs. It efFer- 

 vefces with Aquafortis. In the fire it acquires a confiderable hard- 

 nefs, and a duller colour, with a flight cafl of a reddifh-brown. 

 It is a good manure for light, poor grounds. It is ufed in taking 

 greafe out of boards and woollens. 



In a great marlc-pit at Etall, by the road to Ford, on the left 

 hand, is a ftratum of dufky reddifh-brown marie. It is heavy, 

 and fhattery, on being cut through with a fpade ; unctuous to 

 the touch, but does not colour the fingers ; melts flowly in the 

 mouth, and feems between the teeth like hard foap, pure, and 

 free from grittinefs ; flowly diffufible in water. Depurated, and 

 worked into a pafle, it cuts through with a glofly furface. It 

 docs not efFervefce with Aqua fortis. It crackles in the fire, and 

 acquires a great hardnefs and a dull red. 



In the fame pit is a flratum of friable green ifh-yellow marlc. 

 It makes a quick folution in water, and fends up a great number 

 of bubbles. Dry, it powders the fingers. It effervefces with 

 Aquafortis. In the fire it acquires an orange-colour, and a more 



VOL. I. F f hatter v 



