288 VII. EARTHS AND ALKALIES.— 



Cheshire common salt. By evaporating brine at 160 or 170 

 deg. Fahr. and draining the crystals, which are close, hard, and 

 in square hoppers. Used for striking, and salting provisions 

 intended for cool climates. 



Cheshire large grained flaky salt, British bag salt From brine, 

 evaporated at 130 or 140 deg. Fahr., harder than the common 

 salt, and in crystals approaching to a cubical form. Used for 

 salting provisions for warm climates. 



Cheshire flsherg salt. From brine evaporated 100 or only 110 

 deg. Fahr. in large nearly cubical crystals. Used for salting 

 provisions intended for very hot climates, or long voyages. 



Lymington common salt. By spontaneously evaporating away 

 in shallow ponds five parts out of six of sea water, and quick 

 boiling of the remainder to a nearly solid mass, which is drained 

 in troughs. 



Lymington salt cats. The salt deposited upon stakes by the 

 bittern which drains from the Lymington common salt; is in 

 lumps of 60 or S'Hb. 100 tons of sea water yield only 2 tons 

 17cwt. of salt. The usual proportion at the Lymington works 

 are to each 100 tons of common salt, 1 ton of cat salt, and 4 or 5 

 tons of Epsom salt. 



Scotch common salt. By quick boiling of sea water : is in small 

 crystals. 



Scotch Sunday salt. By making up the fires late on Saturday 

 nights, and leaving the boiling to itself all Sunday ; is in consider- 

 ably larger crystals, which are taken out on Monday morning. 



Salt upon salt. From bay salt dissolved in brine and recrys- 

 tallized. 



Saltpetre salt, Sal salts petrce. The salt that adheres to the 

 sides and bottoms of the settling tubs, in refining saltpetre. 



Decrepitated common salt, Sal communis decrepitatiis, Murias 

 sodcB siccatus. Heat the salt in a covered vessel till it ceases to 

 crackle. 



All these muriates .of soda are stimulant, antiseptic, and hence 

 used as seasoning for food both for man and beast. They are also 

 employed in preserving animal substances, and occasionally in 

 medicine, 3J in clysters as a purge, and jj to two pints of water as 

 a stimulant and absorbent lotion in wens and bruises. 



Sulphate of soda, Sulphas soda^. Glauber's salt dried 8oz., 

 charcoal dust 2 oz., sulphur 1 oz. ; grind together, heat in a cruci- 

 for half an hour, cool, dissolve in water, filter and separate the 

 sulphite from the sulphate, crystallization. 



