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Gradle, Henry (17 August 1855–04 April 1911), ophthalmologist and early proponent of bacteriology, was born in Friedburg, a suburb of Frankfurt-am-Main, Prussia, the son of Bernard Gradle and Rose Schottenfels Groedel. In 1859 Bernard Gradle emigrated to the United States and eventually established himself in the tobacco business in Chicago. Rose Gradle and her son moved to Darmstadt where Henry received his early education; she died in 1866 and two years later, when Henry had finished his elementary education, he joined his father in Chicago....