Preble Co. death records, Book 1, p. 72, lists Prudy E. Arnold, died 4 Sep 1879 at age 4 years,11 months, 20 days (from which I have calculated a birthdate of 15 Sep 1874), born and died in Eldorado, Preble Co., cause of diptheria. She is not listed in Binnie's The German Baptist Arnolds. She also didn't live through any census year, but maybe I will be able to place her on the basis of which Arnold family in Eldorado could fit a child born that year.