Lime lime Calcareous liver of sulphur. Magnesia magnesia Magnesian liver of sulphur. Barytes barytes Barytic liver of sulphur. Argill argill Yet unknown. SECT. VIII.--_Observations on Sulphur, and its Combinations._ Sulphur is a combustible substance, having a very great tendency to combination; it is naturally in a solid state in the ordinary temperature, and requires a heat somewhat higher than boiling water to make it liquify. Sulphur is formed by nature in a considerable degree of purity in the neighbourhood of volcanos; we find it likewise, chiefly in the state of sulphuric acid, combined with argill in aluminous schistus, with lime in gypsum, &c. From these combinations it may be procured in the state of sulphur, by carrying off its oxygen by means of charcoal in a red heat; carbonic acid is formed, and escapes in the state of gas; the sulphur remains combined with the clay, lime, &c. in the state of sulphuret, which is decomposed by acids; the acid unites with the earth into a neutral salt, and the sulphur is precipitated. TABLE _of the Binary Combinations of Phosphorus with the Simple Substances._ _Simple Substances._ _Resulting Compounds._ Caloric Phosphoric gas. { Oxyd of phosphorus. Oxygen { Phosphorous acid. { Phosphoric acid. Hydrogen Phosphuret of hydrogen. Azote Phosphuret of azote. Sulphur Phosphuret of Sulphur. Charcoal Phosphuret of charcoal. Metallic substances Phosphuret of metals(A). Potash } Soda } Ammoniac } Phosphuret of Potash, Lime } Soda, &c.(B) Barytes } Magnesia } Argill } [Note A: Of all these combinations of phosphorus with metals, that with iron only is hitherto known, forming the substance formerly called Siderite; neither is it yet ascertained whether, in this combination, the phosphorus be oxygenated or not.--A.] [Note B: These combinations of phosphorus with the alkalies and earths are not yet known; and, from the experiments of Mr Gengembre, they appear to be impossible--A.] SECT. IX.--_Observations upon Phosphorus, and its Combinations._