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In onychomycosis—an exceedingly obstinate affection—the nails should be kept closely cut and pared, and a one- to five-grain solution of corrosive sublimate applied several times a day; a lotion of sodium hyposulphite, a drachm to the ounce, is also a valuable and safe application.

This salt, commonly called sodium hyposulphite, or merely hypo, is made by boiling a solution of sodium sulphite with sulphur: Na2SO3 + S = Na2S2O3.

More commonly the salt is called sodium hyposulphite, or merely "hypo."

Every reader of the Dreiser novels must cherish astounding specimens—of awkward, platitudinous marginalia, of whole scenes spoiled by bad writing, of phrases as brackish as so many lumps of sodium hyposulphite.

Copper may be separated from its solutions by means of sodium hyposulphite.