Christening ceremony in Tanga, 1904; trip to Gombera, 1904; report about the visit of Professor Haussleiter in Tanga, 1909; thanksgiving song of Africa to the emperor, in Swahili by Jakobo Ngombe, teacher in Tanga, translated into German. by Siegfried Delius, 1910; How our native helpers preach the gospel to the Gentiles, report by Petro Sebwijo in Kibafuta near Tanga, 1914; In Maasailand, our relations with the Maasai and the resulting tasks, 10 pp, ms, 1914; Journey to Maasailand, June 1915; The mission work in Digoland during the war, 1914-1917; The mission work in Tanga and in the hinterland during the years of war, 1914-1917; Health certificates because of retirement, 1926; Five letters from Jakobo Ngombe, 1930-1936; Correspondence with Helene Delius, 1944-1967; Notice of death from Helene Delius, née Layer, 1968