Sir Thomas Walker Arnold,
The Preaching of Islam: A History of the Propagation of the Muslim Faith
“ It is said that an Arab is now seldom seen in Nyasaland, but the Yaos constitute one of the most powerful native tribes in Nyasaland, and look upon Islam as their national faith. Though there appears to be no organised propaganda, Islam has spread very rapidly during the first decade of the twentieth century, and that among some of the most intelligent tribes in the country.108 Islam has achieved a similar success among the Galla and the Somali. Mention has already been made of the Galla [347] settlements in Abyssinia ”
