Excerpt from Pollution of New York Harbor as a Menace to Health by the Dissemination of Intestinal Diseases Through the Agency of the Common House Fly: A ReportDr. Jackson's report demonstrates that the common ¿y is one of the most active agents in disseminating certain intestinal diseases.Bacteriological studies were made of ¿ies that had been feeding on human excreta and they were found to carry vast numbers of disease germs. It was further ...
CHF 39.90
