The manual encompasses fifty five indigenous species. The text of Jackson (1962) unpublished Manual of Silviculture was adopted as basic material for forty two species that were reviewed and updated with more recent information. The post graduate dissertations were also useful sources of information, for example Ishraga (2004) and Sayeda (2003). The sources of information are displayed for the individual species in their respective bibliographies. J.K. Jackson served with the Forests Department from 1944 to 1954, filling within that period the post of silviculturist from 1950 to 1954. He was re-employed by the Forests Department in 1957 after which his status was raised to an international post as FAO Forestry Expert. He prepared the proposal for the Forestry Research and Education Project (1961- 1969). He ended his service in the Sudan after assuming the functions of Manager of the project from 1961 to 1963.