A memoir on the salt springs and salt manufactories in the western part of the state of New-York [microform] : describing the situation and appearance of the springs, the nature and contents of the waters, and the process by which the salt is procured, &c. / By Benjamin De Witt, M.D. corresponding and honorary member of several learned medical, chemical and philosophical societies. ; Read before the Society for the Promotion of Agriculture, Arts and Manufactories of the State of New-York, held at the city of Albany, February 28, 1798.