CHEMICAL TERMS. 303 



Muriatic acid, spirit of sea-salt. 



Muriate of soda, common salt. 



J\ritrate of potash, saltpetre, nitre. 



JVitrates, salts formed by the combination of any base with nitric 



acid. 

 JVeutral salt, a substance formed by the union of an acid with an 



alkali, an earth, or a metallic oxide, in such proportions as to sat- 

 urate both the base and the acid. 

 Oxalic acid, the acid found in sorrel. 

 Oxide, any substance combined with oxygen, in a proportion not 



sufficient to produce acidity ; rust of metals. 

 Oxidize, to combine oxygen with a body without producing acidity. 

 Oxygen, a simple substance, being one of the component parts of water 



and of atmospheric air ; vital air. 

 Oxxjgeii gas, oxygen converted into gas by combining with caloric. 

 Pellicle, a thin skin which forms on the surface of saline and other 



liquids, when boiled down to a certain strength. 

 Pyrolignic acid, an acid obtained from wood by burning. 

 Sal, a salt. 

 Saturation, the act of impregnating a fluid with another substance, 



till no more of it can be received or imbibed. 

 Silicious earths, natural substances which are composed chiefly of 



silica ; as quartz, flint, sand, &c. 

 Simple substances, synonymous with elements ; not divisible. 

 Smelting, the operation of fusing ores, to separate the metal from the 



sulphur, arsenic, and other matters with which it is combined. 

 Solution, the perfect union of a solid substance with a fluid. 

 Sulphates, Sulphats, Sulphites, salts formed by the combination of any 



base with sulphuric acid. 

 Sulphate of copper, blue vhriol ; blue stone. 

 Sulphate of iron, copperas ; green vitriol. 

 Sulphate of lime, gypsum. 

 Sulphate of soda, Glauber's salts. 

 Sulphate of zinc, white vitriol. 

 Sulphate of potash, a chemical salt, composed of sulphuric acid and 



potash. Sulphuret of potash, sulphur and potash fused together. 

 Sulphate of magnesia, Epsom salts. 

 Sulphuric acid, oil of vitriol ; vitriolic acid. 

 Super-tartrate of potash, cream of tartar. 

 Subacetate of copper, verdigris. 



Sulphurets, combinations of alkaline earths or metals with sulphur. 

 Tartaric acid, the acid found in the grape. 

 Tartrates, Tartrites, salts formed by the combination of any base with 



the acid of tartar. 

 Thermometer, an instrument to show the relative heat of bodies and 



of the atmosphere. 

 Trituration, the pulverizing, or uniting of bodies by friction. 

 Torrefaction, roasting of ores. 

 Vacuum, a space unoccupied by matter. 



