To the first class belong the Gospels and Acts; to the second, the Epistles; to the third, the Revelation.

His History of the Apostolic Church (in German 1851; in English 1853) and his History of the Christian Church (7 vols. But at the synod at York in 1845 he was unanimously acquitted. He was one of the founders and honorary secretary of the American branch of the Evangelical Alliance and was sent to Europe in 1869 1872 and 1873 to arrange for the general conference of the Alliance which after two postponements on account of the Franco-Prussian War was held in New York in October 1873.

Philip Schaff (January 1 1819 – October 20 1893) was a Swiss-born German-educated Protestant theologian and a Church historian who spent most of his adult life living and teaching in the United States.