Appendix I. METEORLOGICAL Instruments used for altitudes:-- Pocket aneroid, corrected +0.55, "R.G.S" Casella's Alpine Sympiesometer, corrected to 67° (F.). N.B.-- Returning to Fernando Po, found that part of the liquid has lodged in upper bulb, and therefore corrected index error by standard aneroid 1.15 (Symp. = 29.258, and standard, 30.400). Observations at the Congo mouth in February, 1863 (from log of H.M.S. "Griffon"). Thermometer Barometer Winds Place Engine in sea. Force & Direction Room. A.M. P.M. 86° 76° 29.90 (1) S.E. (1) N.N.W. Loanda. 92° 77° 29.92 (1) S.W. (2) W.N.W. En route to Congo. 108° 76° 29.90 (1) S. (3) S.S.W. En route to Congo. 86° 78° 29.90 (2) S. (3) W. En route to Congo. 88° 78° 29.90 (2) S.W. (2) S.S.W. En route to Congo. 94° 80° 29.90 (2) S.E. (2) S.W. En route to Congo. 90° 83° 29.90 (2) S. (2-3)S. Congo. 90° 80° 29.90 (0) Calm (1) W. Congo. (Signed) F. F. Flynne, Assistant-Surgeon in Charge. Place and Date. Time of Day. Thermometer. Symp. Remarks. 9th September 6 a.m. 65° 28.00 cor. 29.12 Cold morning, light wind from N.N.E., Banza nokki 9 a.m. 72° 27.70 cor. 28.82 threatened rain, 8 a.m.; noon misty, on hills above Noon. 78° 27.90 cor. 29.02 day hazy; 3 p.m., sun hot, wind cooler river 3 p.m. 80.5° 27.85 cor. 28.97 from west; evening, stiff sea-breeze, 6 p.m. 72° 27.90 cor. 29.02 people complain of cold; night, heavy dew. 10th Sept. 6 a.m. 67° 27.90 cor. 29.02 Misty morning, warm at 9 a.m., wind; noon, Same place, 9 a.m. 75° 27.75 cor. 28.87 hot sun, high sea-breeze; 3 p.m., hot Nokki. Noon. 83° 27.85 cor. 28.97 sun, cool west wind; cloudy evening; 3 p.m. 85° 27.75 cor. 28.87 windy night, dew cold and heavy. 6 p.m. 74° 27.85 cor. 28.97 Altitude of Nokki above sea, 1,430 feet.