A lecture argues that establishing colonies of free black emigrants and recaptured Africans has served as an effective auxiliary to missionary work in West Africa. It recounts early exploration and settlement, highlights founding advocates, and compares mission types—those protected within colonies, missions among liberated communities, efforts among independent native tribes, and work in southern colonial regions—using emigration trends, institutional supports, and reported missionary outcomes to contend that colonies often fostered greater progress by providing security and educated local intermediaries, while also acknowledging opposition, violence, and practical challenges to evangelization across the continent.