74 Wilks, , ‘The growth of the Akwapim state: a study in the control of evidence”, in The Historian in Tropical Africa, ed. Vansina, J., Mauny, R. and Thomas, L. V. (1964), 396 et seq. In this paper I suggested that the normal distribution of reign lengths is linked with other regular distributions, e.g. age at coming to office, age at death. It is now clear to me that the crucial factor is the succession system, i.e. the ratio of lateral (brother, etc.) to vertical (son, nephew, etc.) succession. In Kumasi, therefore, the strong tendency to constancy in length of tenure of office reflects the incidence of fraternal succession, which is similar for all types of stools.Google Scholar