West Africa 1. M.J. Field , Spirit Possession in Ghana 2. Robin Horton , Types of Spirit Possession in Kalabari Region 3. Pierre Verger , Trance and Convention in Nago-Yoruba Spirit Mediumship Central and South Africa 1. Elizabeth Colson , Spirit Possession Among the Tonga of Zambia 2. G. Kingsley Garbett , Spirit Mediums as Mediators in Valley Korekore Society 3. S.G. Lee , Spirit Possession Among the Zulu East Africa 1. John Beattie , Spirit Mediumship in Bunyoro 2. Robert F. Fray, The Shetani Cult Among the Segeju of Tanzania 3. I.M. Lewis , Spirit Possession in Northern Somaliland 4. John Middleton , Spirit Possession Among the Lugbara 5. Aidan Southall , Spirit Possession and Mediumship Among the Alur 6. R.E.S. Tanner , The Theory and Practice of Sukuma Spirit Mediumship 7. F.B. Welbourn, Spirit Initiation in Ankole and a Christian Spirit Movement in Western Kenya