 He died in 1889 in Heidelberg

His theological work largely dealt with the history of Protestant dogmatics, studies of the Greek Orthodox Church during the Middle Ages and the history of Christian ethics.Among his more important written works was the four-volume "Geschichte der Lutherischen Dogmatik" (History of Lutheran Dogmatics 1854-67), and an 1846 book on Georgius Calixtus and syncretism called "Georg Calixt und der Synkretismus".Other noted works by Wilhelm Gass include