An early secession from the general body of Dunkers was that of the Seventh Day Dunkers, whose distinctive principle was that the seventh day was the true Sabbath.
The same element in the Brethren opposed a census, but according to Howard Miller's census of 1880 (Record of the Faithful) the number of Dunkers was 59,749 in that year; by the United States census of 1890 it was then 73,795; the figures for 1904 are given by Henry King Carroll in his.
Of the Pennsylvania German Society, Proceedings and Addresses (Lancaster, Penn., 1900); Julius Friedrich Sachse, The German Sectarians of Pennsylvania, 1742-1800: A Critical and Legendary History of the Ephrata Cloister and the Dunkers (Philadelphia, 1900); and John Lewis Gillin, The Dunkers: A Sociological Interpretation (New York, 1906), a doctor's dissertation,, with full bibliography.
There were Dutch, Swedes, English, Germans, Welsh, Irish and Scotch-Irish; Quakers, Presbyterians, Episcopalians, Catholics, Lutherans (Reformed), Mennonites, Dunkers, Schwenkfelders, and Moravians.
The publishing office of the Dunkers, or German Brethren, is at Elgin; and several popular weeklies with large circulations are published here.