The collection is composed of 100 lantern slides that depict missionary activity from around the world. Places depicted in these slides include Africa, India, Russia, Iraq, Jamaica, Italy, and Spain. They also include some of the important individuals within the Brethren including A. N. Groves and J. N. Darby. Some of the slides are from the set produced by the London Missionary Society: 'The Life and Work of David Livingstone'. However, some of the images in this collection are slightly different versions (for instance, here BLS/5 contains a photograph of King Khama, wheras the LMS version at the National Portrait Gallery contains a coloured drawing).
The depictions on the slides vary, and range from photographic content to drawings of scenes and people. They also include maps, religious verses and collages of brethren members.
The slides contain much of interest to those studying Christian mission in general and missionary activity abroad. It may also be of interest to anthropologists wanting to look at the role and impact of missionaries in traditional and post industrial societies.