tints which the clouds assume during the setting of the sun in the beginning and latter end of the rains, and which is so well marked in intertropical Western Africa, are produced by the reflection, refraction, and decomposition of the light of the sun by the aqueous vapour of the atmosphere.

OBSERVATIONS ON THE GOLD Coast, Bights of Benin, and SIERRA LEONE, FOR 1859, 1860.

BAROMETER, OZONOMETER, AMOUNT OF CLOUD, AND NOTATION OF

WEATHER.

January.

Barometer.

MAXIMUM OBSERVATIONS.-Morning-7th, 30°-98; 8th, 31°. Noon-7th, 30°-98; 8th, 31°. Evening-7th, 30°-98; 8th, 31°. MEDIUM OBSERVATIONS.-Morning-6th, 30°.90. Noon-6th and 10th, 30°-87. Evening-5th, 30°.80.

MINIMUM OBSERVATIONS.-Morning-13th, 30°-72. Noon-2nd and 4th, 30°.74. Evening-4th and 12th, 30°-72.

Weather.

Wet-Day, 1; night, 1. Fair-Days, 27; nights, 27. Cloudy -Days, 3; nights, 3.

February.
Weather.

Wet-Days, 2; night, 1. Fair-Days, 20; nights, 22. Cloudy -Days, 7; nights, 6.

March.

Amount of Cloud.

MAXIMUM OBSERVATIONS.-Morning-21st, 1° S. W. by S. Noon -17th, 5° zenith S. to N.W. Evening-15th, 10° W. and S.W. MEDIUM OBSERVATIONS.-Morning-13th, 17th, 23rd, and 26th, 0°.8. Noon-12th and 13th, 2°. Evening-15th, 1°.

MINIMUM OBSERVATIONS.-Morning-16th, 0°-2 W. Noon22nd, 0°3 S. W. Evening-22nd, 0°.2 S.

Ozonometer.

DAY OBSERVATIONS.-Maximum-25th, 9°. Medium-23rd and 24th, 6°. Minimum-23rd, 1o.

NIGHT OBSERVATIONS.-Maximum-28th, 10°. Medium--23rd, 25th, and 30th, 8°.1. Minimum-22nd, 4°.

MAXIMUM OBSERVATIONS.-Morning-23rd, 7°3. Noon-21st, 10°. Evening-5th, 8°.2; 6th, 10°.

MEDIUM OBSERVATIONS.-Morning-5th, 8th, 18th, 20th, 25th, and 29th, 2°. Noon-5th and 23rd, 6°.3. Evening-5th and 28th, 6°.4.

MINIMUM OBSERVATIONS.-Morning-11th and 17th, 0°-5. Noon -25th, 0°7. Evening-2nd, 0°.8.

Ozonometer.

DAY OBSERVATIONS.-Maximum-2nd, 8°.2. Medium-4th, 7°·1. Minimum-6th, 13th, and 22nd, 1°.

NIGHT OBSERVATIONS.-Maximum-28th, 9°•4.

and 25th, 7°.3. Minimum-17th and 22nd, 1°.5.

Weather.

Medium-1st

Wet-Days, 4; nights, 4. Fair-Days, 17; nights, 15. Cloudy -Days, 9; nights, 11.

May.

Amount of Cloud.

MAXIMUM OBSERVATIONS.-Morning-2nd, 14th, and 31st, 10°; 4th, 22nd, and 24th, 8°.2. Noon-9th and 27th, 10°; 25th, 9°.1. Evening-1st and 22nd, 10°; 9th and 30th, 8°.2.

MEDIUM OBSERVATIONS.-Morning-30th, 7°4. Noon-7th and 21st, 5°. Evening-3rd and 29th, 6°.4.

MINIMUM OBSERVATIONS.-Morning-16th, 0°.2. Noon-16th, 0°5. Evening-18th, 0°.5.

Ozonometer.

DAY OBSERVATIONS.-Maximum-4th, 7°3; 2nd and 31st, 5°. Medium-5th, 23rd, and 30th, 2°. Minimum-6th and 16th, 0°.2. NIGHT OBSERVATIONS.-Maximum-1st and 30th, 8°.2; 2nd, 3rd, and 4th, 7°; 31st, 6°4. Medium-14th and 20th, 6°; 5th, 5°. Minimum-26th, 0°·1.

Weather.

Wet-Days, 3; nights, 7. Fair-Days, 21; nights, 17. Cloudy -Days, 8; nights, 14.

June.

Amount of Cloud.

MAXIMUM OBSERVATIONS.-Morning-17th, 19th, and 20th, 10°, all directions. Noon-17th, 10° E.N.E. to S.W.; 22nd, 10° N. to E.N.E.; 28th, 10°, all directions. Evening-18th, 27th, and 28th, 10°, all directions.

MEDIUM OBSERVATIONS.-Morning-22nd, 6° S.S.W. to N.N.W. Noon-18th and 19th, 7°; 27th, N.E. and W.S.W. Evening-16th, 5° N. to W.

MINIMUM OBSERVATIONS.-Morning-20th, 1° E. Noon-7th, 0°5, scattered. Evening-20th, 0°-2, scattered.

Ozonometer.

DAY OBSERVATIONS.-Maximum-19th, 9°; 18th, 8°; 26th, 6°4 ; 27th, 6°. Medium-21st, 5°; 1st, 2nd, 20th, and 28th, 4°. Minimum-30th, 0°.5.

NIGHT OBSERVATIONS.-Maximum-18th, 8°; 26th and 27th, 7°; 16th and 17th, 6°4. Medium-24th and 21st, 5°; 1st and 23rd,

MAXIMUM OBSERVATIONS.-Morning-1st, 12th, 15th, 16th, 27th, and 31st, 10°, in all directions; 4th, 10° N.E., W. to S.S.W. Noon-1st, 6th, 7th, 29th, 30th, and 31st, 10°, all directions. Evening-5th, 6th, 12th, and 29th, 10°, all directions.

MEDIUM OBSERVATIONS.-Morning-25th, 6° zenith. Noon15th and 27th, 64° N. and S. W. Evening-16th, 6° S.W. to N.E. MINIMUM OBSERVATIONS.-Morning-10th, 1° N. to N.W. Noon -8th and 24th, 2°. Evening-11th, 0°.1.

Ozonometer.

DAY OBSERVATIONS.-Maximum-22nd, 6°·4; 16th, 21st, and 26th, 5°. Medium-25th, 4°. Minimum-3rd, 0°.2.

NIGHT OBSERVATIONS.-Maximum-31st, 7°3; 16th and 30th, 6°4; 17th, 24th, 26th, and 27th, 6°; 14th, 15th, 21st, 25th, and 28th, 5°. Medium-12th, 22nd, and 29th, 4°1; 6th, 4°; 5th, 20th, and 23rd, 3°. Minimum-2nd and 4th, 0°.5.

Saturation of the Atmosphere.

MAXIMUM OBSERVATIONS.-Morning-15th, 881°·4; 15th, 17th, 18th, 19th, 20th, and 24th, 876°·4. Noon-13th, 848°7; 17th, 822° 1. Evening-17th, 876°.7.

MEDIUM OBSERVATIONS.-Morning-21st, 820°.9. Noon-27th, 743° 7. Evening-16th, 694°.7.

MINIMUM OBSERVATIONS.-Morning-27th, 766°5. Noon-16th, 670°.9. Evening-9th, 792°.

Dew-Point.

MAXIMUM OBSERVATIONS.-Morning-18th and 20th, 76°; 17th, 19th, and 24th, 75°. Noon-13th and 17th, 78°. Evening-17th and 24th, 76°.

MEDIUM OBSERVATIONS.-Morning-21st, 74°. Noon-23rd, 75°. Evening-16th, 74°.

MINIMUM OBSERVATIONS.-Morning-27th and 28th, 70°. Noon16th, 72°. Evening-9th, 72°.

December.
Hygrometer.

MAXIMUM OBSERVATIONS.-Morning-14th, 5°25; 5th and 6th, 5°. Noon-6th, 7°.15; 1st, 8th, and 11th, 6°.10. Evening-11th, 5°.30; 2nd and 5th, 5°.25.

MEDIUM OBSERVATIONS.-Morning-3rd and 7th, 4°. Noon-1st, 8th, and 11th, 6°. Evening-16th and 17th, 5°.

MINIMUM OBSERVATIONS.-Morning-2nd, 2°-25. Noon-4th, 4°.5. Evening-15th, 4°41.

Saturation of the Atmosphere.

MAXIMUM OBSERVATIONS.-Morning-8th, 936°2. Noon-4th, 793° 6. Evening-11th, 821°.6.

MEDIUM OBSERVATIONS.-Morning-4th, 819°. Noon-11th, 760°-9. Evening-16th and 17th, 821°.6.

MINIMUM OBSERVATIONS.-Morning-6th, 727°-7; 8th, 790°-4. Evening-11th, 795°.

Dew-Point.

MAXIMUM OBSERVATIONS.-Morning-7th and 11th, 74°. Noon6th, 74°. Evening-15th, 78°.

MEDIUM OBSERVATIONS.-Morning-4th, 73°. Noon-4th and 7th, 74°. Evening-5th, 16th, and 17th, 77°.

MINIMUM OBSERVATIONS.-Morning-1st and 3rd, 73°. Noon— 1st, 74°. Evening-11th, 76°.

In August 1860, the following was the Dew-Point registered in the Military Hospital, Sierra Leone:

REGISTER OF DEW-POINT IN THE MILITARY HOSPITAL, BATHURST,

Jan.

70-1 65.43 66-76 68.8 62.96 61 33 59-2660-96 63-10 58 64.7 66.66 61 63 56-9958-6463-77 Feb. 57-856-9 51-3 59.3 61.0 58.2 57-9 58.0 52.1 53.4 57 64.2 64.4 64 63.2 65.3 March, 59-260.6 59.9 58.5 56.2 55.9 60-6 58.8 57 57.7 58-262-2 66.5 57.5 55.2 55.7 April, 62-662.9 61.6 61-363-4 637 633 65.3 66.2 68-364-266.1 63.9 58.3 64.5 57.1 May, 59.159 59-3 56-7 61.2 58.6 59.8 56 58.8 58.3 59.5 60.5 61.9 57.8 59.7 61.3 June, 57 4 63-6 61-2 59-264.3 601 60.5 62.1 58.6 61 58 61-4 595 59-1 59-4 60-9