For more than forty years Robert Clark was the senior Church Missionary Society representative in the Punjab, organising the building of missions in the province and on the frontier, founding schools for both sexes, establishing hospitals, dispensaries and agricultural settlements, encouraging Indian converts to play active roles in the church, and (with an Indian colleague) writing scriptural commentaries for their use. Light is thrown on many aspects of Clark’s work in the correspondence catalogued here, which consists principally of letters to Clark from officers of the CMS in London and Calcutta (half of them from his close friend the Reverend Joseph Welland, officiating secretary of the Calcutta committee of the CMS during the mid 1870s).