throughout the 1st, and until 6.50 A.M. of the 2nd; it then fell rapidly for half an hour, rising regularly afterwards. The mean temperature on the 4th was 50.9°; the next day it was much lower, 40.3°. The thermometric curve of the night of the 5th was much disturbed by small oscillations. From 34.8° on the 6th, the means increased to 44.1° on the 12th. During the 12th and 13th there was very little variation in the temperature, but at 5.30 A.M. on the 14th, a sudden rise of 5° was registered; 34.0°, the mean for the 20th was the lowest in the month. A continuous uniform rise of the thermometer from 4 A.M. of the 21st, to the same hour of the 22nd, brought the readings to 51.1°; afterwards a rapid fall, between 8 and 11 P.M. on the 24th, reduced them to [38.8°. The mean on the 29th was 34.5°, and 40.0° on the 30th. The highest maxima recorded were 56.9° on the 1st, and 55.4° on the 3rd; the lowest 41.2° on the 6th, and 41.4° on the 20th. The highest minima were 52.7° on the 1st, and 50.3° on the 4th; the lowest, 24-6° on the 20th, and 26.0° on the 29th. The thermometer also went below 32° on the 6th, 8th, 9th, 16th, 21st, and 30th. The greatest daily range was 16.8° on the 20th; the least, 2.8° on the 13th; and the mean 10·3°. The mean temperature for the month was 42.2°. RELATIVE HUMIDITY.-The days when there was the largest amount of moisture present in the air, were the 2nd, 21st, and 26th, when 0.93, 0.98, and 0.91 were the respective degrees. The 5th, 19th, and 20th were those of least humidity, having 0.68, 0.68, and 0.63. The mean amount for the month was 0.84 (complete saturation being 1.00). RAINFALL. Rain was measured as follows: Total fall during the month being 0.917 ins. WIND. The general direction of the wind was:- North-East-9th, 10th, 11th, 12th, 15th, 16th, 17th, 19th, 26th, 27th, and 28th. East-18th. South-East-20th and 30th. South-21st, 22nd, 25th, and 29th. West-1st, 2nd, 3rd, 4th, 23rd, and 24th. North-West-5th. The features of note in the November anemograms are the following: 2nd, 7 A.M., the direction changed from S.W. to N., returning to S.W. at 9.25 A.M.; 3rd, 670 miles of wind passed over the instrument in twenty-four hours. At 9.30 A.M. on the 6th, the direction veered from W. to N., the velocity at the same time increasing from 3 to 12 miles per hour. During the morning of the 8th, the wind went from N. to W., and back to N. At 1.30 A.M. on the 16th, the direction changed from N.E. to S., returning to N.E. at 10.5 A.M. 635 miles were registered on the 22nd, but the velocity diminished considerably between 7.30 A.M. and 10 A.M. on the 23rd, the wind gradually passing from S. through W. to N. 25th, 0.35 A.M., a change from W. to S.E. occurred. The mean velocity on the 28th was 2 miles, the lowest in the month. At 0.20 P.M. on the 29th, the direction veered from N.E. to S. DECEMBER, 1868. ATMOSPHERIC PRESSURE.-The various storms which occurred in December were accompanied by large barometric fluctuations. The month commenced with the barometer at 29.764 ins., falling at a uniform rate, with the exception of the last few hours of fall, • from 9 A.M. to 2 P.M. of the 5th, for which period it was in constant oscillation. The mean for the 5th was 29.425 ins. There was an increase of pressure on the morning of the 7th, followed by a contrary movement in the evening. The barometer rose rapidly from 7.30 P.M. of the 8th for twenty-four hours, so reaching the maximum for the month 30-261 ins. on the 9th. The lowest point of the fall which succeeded was recorded at 1.40 P.M. on the 11th, that day's mean being 29-283 ins. Having risen until 12th, 10 A.M. the mercurial column became more steady, falling slowly until the 15th. THERMOMETER THERMOMETER DIAGRAMS, REPRESENTING THE METEOROLOGICAL VARIATIONS, OBSERVED AT THE KEW OBSERVATORY. OCTOBER, 1868. 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MAXIMUM DAILY MEAN MINIMUM RELATIVE HUMIDITY 29.5 50° 50% 100 0.60 1.00 MAXIMUM 50. DAILY MEAN 40] MINIMUM RELATIVE HUMIDITY 38 0.80 1.00 އ NOVEMBER, 1868. 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 23 30 ↑ ↑ DECEMBER, 1868. 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 3 |