"It's the only thing ye ever was persistent in, Lord knows!" muttered Aunt Chloe, who was getting rather restive; the merriment of the evening being to her somewhat after the Scripture comparison,—like "vinegar upon nitre."
Harriet Beecher Stowe. Uncle Tom's Cabin
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and fifty men at work. Some were condensing air into a dry tangible substance, by extracting the nitre, and letting the aqueous or fluid particles percolate; others softening marble, for pillows and pin-cushions; others petrifying the hoofs of a living horse, to preserve them from foundering.
Jonathan Swift. Gulliver's Travels Into Several Remote Regions of the World (1726)