Fetichism in West Africa: Forty Years' Observation of Native Customs and Superstitions by Robert Hamill Nassau is a seminal ethnographic work documenting the spiritual beliefs, rituals, and cultural practices of West African societies in the late 19th and early 20th centuries. Drawing upon four decades of missionary experience in Gabon and Cameroon, Nassau provides a detailed, firsthand study of what he termed "fetichism"-the indigenous religious systems rooted in symbolism, nature worship, and ancestral reverence. While written from a Western missionary perspective, the book remains an invaluable historical record of African cosmology and local customs prior to widespread Western influence. Nassau's careful documentation of ceremonies, charms, and belief structures offers rare insights into the complexity, coherence, and social significance of traditional African religions. Today, Fetichism in West Africa stands as both a historical artifact and an important resource for scholars of African studies, anthropology, and the history of religion-preserving voices and traditions that shaped the continent's cultural and spiritual identity.