Page:Popular Science Monthly Volume 21.djvu/366

354 shallow, containing a plastic soda-mud in the form of chloride and carbonate, deriving its carbonic acid from one source and its chlorine from another during its deposition, or, subsequently, fissures were opened



in the subjacent strata, allowing the escape of a limited amount of jets of boracid acid from beneath in vapor, we should have all the conditions required to account for the formation of the borax in the midst of the two more loosely combined salts.