saltpeter

If the Union can not be preserved without saltpeter, then let enough of this article be employed to secure the result.

They found a place where saltpeter was very thinly and erratically distributed.

He gave enormous doses of powerful drugs—sixty grains of gamboge, and from two to three ounces of saltpeter in a single day.

Since smoked and cured meats are used in making potted meats, saltpeter is quite frequently found in the latter.