Originally published in 1942 this now classic book is a study of the Nupe of Northern Nigeria. The economic and political complexity of their kingdom evoked comparisons with the civilization of Byzantium. The detailed description and analysis of their social life and political institutions was the first study of a Muslim Emirate in Nigeria and as such is still an indispensable work.

Originally published in 1954, this book is a pentrating study of Nupe religion and the increasing influence that Islam has had on indigenous forms of worship. The practise of witchcraft, forms of ritual, Gods and faith in medicine are all examined as an integral part of Nupe religion and culture.