Four lectures delivered in Christ Church Cathedral, Zanzibar. The lectures were delivered to a European congregation and the writer makes no claim to originality, using various translations of the Koran and other Islamic texts. However, he states the conclusions found within the lectures have been verified through discussion with Muhammadans, his contact with Muhammadanism in Zanzibar and his study of the original Koran. Lectures are entitled: Christianity and Muhammadanism; Christ and Muhammad; The Bible and the Koran; Spirit of Islam and the Spirit of Christianity.