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Many of the records come from the Confederate nitre and mining bureau, which was set up to produce saltpeter, among other things.

They were in a long, dim cellar with barrel-vaulted ceilings, its stone walls spotted with nitre.

The walls were discolored with patches of nitre.

He remembered walls of pale red stone festooned with patches of nitre, a grey door of splintered wood, four inches thick and studded with iron.

Sulphur and nitre should be given in the food, as the appearance of these swellings, whatever be their cause, indicates the necessity of alterative medicines.