PART 1. 9. METHODS ADOPTED TO SECURE THE PURITY OF SEED DISTRIBUTED FOR SOWING PURPOSES. (Paper by H. C. Sampson, Empire Cotton Growing Corporation. T.C.(C).Cot.6.) (See page 144.) 8. ‘“* Mass’ METHODS FOR MAINTAINING THE QUALITY OF COTTON ‘SEED. (Paper by the Agricultural Department, Tanganyika Territory. T.C.(C).Cot.9.) (See page 152.) * INTBRCHANGE OF VARIETIES AND PURENESS OF STRAIN OF COTTON FOR "TRIAL AND OBSERVATION IN VARIOUS AFRICAN TERRITORIES. (Paper by the Agricultural Department, Southern Rhodesia.) (See page 144.) 5. THE CONTROL OF (JINNERIES, WITH SPECIAL REFERENCE TO THE SPREAD OF DISEASE. (Paper by H. C. Sampson, Empire Cotton Growing Corporation. T.C.(C).Cot.7.) (See page 183.) Note.—The Agricultural Department, Belgian ‘Congo, desire information on methods of control of Cotton ‘Ginneries. 6. YIELD IMPROVEMENT BY MEANS OF FIELD EXPERIMENTS. (To be raised by the Agricultural Department, Uganda.) (See page 144.) 7. A PROMISING SPECIES OF WILD CcrroN IN THE MOZAMBIQUE Company's TERRITORY. (Paper by Baron Surcouf of the Mozambique Company’s Territory. T.C.(C).Cot.13.) (See page 156.) 8. Native CcrroN INDUSTRY IN THE TERRITORY OF THE MOZAMBIQUE COMPANY. (Paper by Senhor L. de Sa Pereira, Cotton Expert of the Mozambique Company. T.C.(C).Cot.14.) (See page 137.) CATEGORY 1V. ENTOMOLOGY AND MYCQLQGY. BIOLOGICAL CONTROL OF INSECT PESTS, WITH PARTICULAR REFERENCE TO THE CONTROL OF THE coMMON CoFFEE MEALY Bua in Kenya CoLoNY. (Paper by T. W. Kirkpatrick, Assistant Entomologist, Kenya. T.C.(C)E. & M.2.) (See page 184.) 9. SOME FACTORS INFLUENCING THE OCCURRENCE AND DISTRIBUTION oF PLANT pIsrASES IN KENYA. (Paper by J. McDonald, Mycologist, Kenya. T.C.(C)E. & M.3.) (See page 214.) 15