This volume presents the 25-year correspondence between a Roman Catholic missionary, Fr. Francois Laydevant, who worked in Lesotho from 1905-1954 and a Roman Catholic missiologist, Fr. Albert Perbal, based in Rome, Italy. The exchange of letters was provoked by the missiologist who needed direct information from the mission field for his own research and teaching, and more importantly, to fulfil his role of consultant with the Institute for the Study of African Languages and Cultures in London and the Conference Romaine des Missions Catholiques d'Afrique in Rome. The main result of the correspondence, apart from fulfilling the above-stated purpose, was to propel Fr. Laydevant into fruitful anthropological, ethnological and historical research into Lesotho and its people. The correspondence deals with many contemporary missiological problems of the time. It is also a primary source for the history of the Church, particularly the Roman Catholic Church, in Lesotho.