The purpose of this book is to study Britain's progressive involvement in Borneo from i860 to 1888, and to show how it reflected the development of policy in London. The bulk of the work was written in 1963 as a thesis presented for the Ph.D. degree in the University of London. Part of Chapter Three of the thesis was published in the Sarawak Museum Journal, (Vol. XI, Nos. 23-24) in 1964, and parts of Chapter Six appeared in 'The Partition of Brunei' which was published in Asian Studies (Institute of Asian Studies, University of the Philippines, Quezon City) in August 1967.