saleratus

It's only spring, yet they are thicker round here already than lumps of saleratus in those biscuit we've been talkin' about.

From The Postmaster by Joseph C. Lincoln

Dissolve a tea spoonful of saleratus, in half a tea cup of water and strain it into the cake, knead in flour till quite stiff.

From The New England Cook Book, or Young Housekeeper's Guide Being a Collection of the Most Valuable Receipts; Embracing all the Various Branches of Cookery, and Written in a Minute and Methodical Manner by Anonymous

Some people use only a tea spoonful of saleratus, to a pint of molasses, but it is much better with more, appearing in point of lightness like sponge cake.

From The New England Cook Book, or Young Housekeeper's Guide Being a Collection of the Most Valuable Receipts; Embracing all the Various Branches of Cookery, and Written in a Minute and Methodical Manner by Anonymous

Some use bolted meal; most raise bread by fermentation; many use salt; some saleratus, or carbonate of potash; and, in the country, many use milk instead of water to form the paste.

From Vegetable Diet: As Sanctioned by Medical Men, and by Experience in All Ages Including a System of Vegetable Cookery by William A. (William Andrus) Alcott

It is 60 like the saleratus which the pioneers used to cast into their barrels of Missouri River water, to precipitate the silt and make it clear.

From The Rustler of Wind River by George W. (George Washington) Ogden