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The air was faintly yellow, the sky was yellow with a greenish cast, and the clouds were green-gray. No human had ever set foot on the surface, or breathed the air, of Niflheim. To have done so would have been instant death; the air was a mixture of free fluorine and fluoride gasses, the soil was metallic fluorides, damp with acid rains, and the river was pure hydrofluoric acid.
In the two supplemental table cases, 57 A and B, the visitor may notice specimens of Pyromorphite, a combination of phosphate and chloride of lead, and a combination of chloride of calcium with phosphate of lime. These combinations, however, cannot interest the general visitor. The case marked 58 contains the varieties of Fluorides, or combinations of fluorine and the metals.
These include the fluoride of calcium, of which the most familiar variety to Englishmen is that known as Derbyshire spar, of which many useful articles are manufactured in this country. Ladies particularly will halt with interest before the case marked 58 A, where the fluorides, better known as the topaz, are deposited. These include a fine series of crystals from the Brazils, Siberia, and Saxony.
In its elementary form it is an irritating gas, used for bleaching purposes. Fluorine is present in small quantities in the body, appearing as fluorides in the bones and teeth. It is supplied by the various foods. In its elementary form it is a poisonous gas. Potassium is found in the body in very small quantities, but it is very important.
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