1. General Introduction.- 2. The Valley Floor, Creep and Flood Sheet.- 3. Valley Sides — Formation of Arenas.- 4. Concentrating Power of the Rivers.- 5. Evidences of Warping — Swamp Divide.- 1. Wishikatwa.- 2. Development of the Lower Division Outside Wishikatwa.- 3. Middle and Upper Divisions of the Karagwe-Ankolian System.- 4. A Technical Discussion of the Mapping of Arenas.- 5. Correlation.- 6. Description of the Granites — Abnormal Textures — Basic Dykes.- 1. Various Phases of Folding — Nature of Contact — Manner of Intrusion.- 1. Introducton.- 2. Injection Schists.- 3. The Formation of Magmatic Solutions.- 4. Introduction; Sequence of Deposition.- 5. Sericite Phyllites in the Vicinity of Granite.- 6. Metamorphism Along Faults — Formation of Metasomatic Veins.- 1. Introduction.- 2. General Description.- 3. Microscopical Investigations.- 4. General Introduction.- 5. Transitional Zone Of Kashozo Veins.- 6. The Vein-Filling — Buramma and Ruechimarra Deposits.- 7. Crushed Quartz.- 8. General Description.- 9. Microscopical Investigations.- D. Conclusions.