Introduction / Archie Mafeje and Samir Radwan -- 1. The Population Factor in African Change / John C. Caldwell -- 2. Human Demography and Animal Demography in Pastoral Societies of the Sahel / Brigitte Thebaud -- 3. The Agrarian Response to Population Growth in Kenya / Paul Collier and Paul Horsnell -- 4. Income distribution and its Implications for Migration in Sub-Saharan Africa / John Weeks -- 5. Some Socio-Demographic Aspects of Rural Labour Markets and Labour Migration in Gezira (Sudan) / Hassan Musa Yousif -- 6. The Growth of African Cities: Theory and Estimates / Charles M. Becker and Andrew R. Morrison -- 7. Food-Production Potential of African Lands and Projections to 2000 / Nikos Alexandratos.