An unidentified Métis fur trader of Native American and French ancestry, ca. 1870.

Antoine Blanc Gingras, Métis fur trader and member of the Minnesota Territorial Legislature, ca. 1855.

Two men, probably Métis, preparing a Red River cart train at Pembina, 1856.

Ecolab buildings, St. Paul, July 2017. In the foreground, the new Ecolab headquarters in downtown St. Paul. Behind can be seen the old tower on Wabasha, still bearing the Ecolab name.

Ecolab building, 2014. Photograph by Wikimedia Commons user McGhiever.

Economics Laboratory, 293 Como Avenue, St. Paul, October 8, 1962.

Economics Laboratory, 800 Eustis Street, St. Paul, ca. 1956.

Economics Laboratory, 144–146 South Livingston Avenue, St. Paul, ca. 1955.

Parade float promoting Soilax, a dishwasher detergent, at the Economics Laboratory in St. Paul, ca. 1955.

Early formula for dishwashing detergent Electrasol, 1948. Early product formulations were kept in a booklet by chemist John Lewis Wilson. From Ecolab Company Records, Minnesota Historical Society.