However, these are often counted as separate languages despite common ethnic origins due to linguistic shift occasioned by geographical movement.[4] From 1906 to 1921, Carscallen was superintendent of the Seventh-day Adventist Church's British East Africa Mission, and was charged with establishing missionary stations in eastern Kenya near Lake Victoria and proselytizing among the local population.These stations would include Gendia, Wire Hill, Rusinga Island, Kanyadoto, Karungu, Kisii (Nyanchwa), and Kamagambo.Then, a little more than two years later, the mission translated portions of the New Testament from English to Dholuo, which were later published by the British and Foreign Bible Society.In addition to the grammar text, Carscallen compiled an extensive dictionary of "Kavirondo" (Dholuo) and English, which is housed at the School of Oriental and African Studies, University of London, UK.