[ 1^-1 ] 



XVIII . On the Meteoroluyy of England and the South of Scotland 

 during the Quarter ending December 31, 1850. By James 

 Glaisher, Esq., F.R.S., Secretary of the British Meteorolo- 

 gical Society^. 



THE mean daily temperatures of the air were below their 

 average vahies till October 30, excepting the 17th, 18th 

 and 19th days ; the mean deficiency was 2°"6. From October 31 

 to November 12, the period was warm ; the average daily excess 

 was 5°'l ; the 13th, 14th, and 15th days were cold; their ave- 

 rage defect was 5°'3. From November 16 to November 25, the 

 average daily excess of temperature was 3°"2 ; from November 26 

 to December 3, the average defect was 4°' 7. December 4 and 5 

 were in excess to the amount of 6°'3 ; from the 6th to the 1 1th 

 was in defect to the amount of 4°'3 daily ; from the 11th to the 

 16th the excess was 4°"7 ; from December 17 to December 23 

 it was 4°'4 in defect ; and on December 24 a period of veiy 

 warm Aveather set in ; and till the end of the year the daily ex- 

 cess of temperature was 6°-3. The mean temperature of Decem- 

 ber 31 was 50° nearly, and exceeding its average value by 13°. 



During the whole quarter there has been an unusual amount 

 of fog, it having been prevalent more or less on 69 days. 



The mean temperature of the air at Greemvich for the three 

 months ending November, constituting the three autumnal 

 months, was 50°, being 0°"7 above the average of the preceding 

 seventy-nine autumns. 



For the month of October was 47°'0, being 2°3 less than the 

 average of seventy-nine years, and 2°'8 less than that of nine 

 years. 



For the month of November was 46°" 5, exceeding the average 

 of seventy-nine years by 4°"1, and of the preceding nine years 

 by2°-l. 



For the month of December was 40°'6, exceeding the average 

 of seventy-nine years by 1°"8, and that of the preceding nine 

 years by 0°-2. 



The mean for the quarter was 44°* 7, exceeding th&t of the ave- 

 rage of seventy-nine quarters by 1°'2, and less than that of the 

 preceding nine years by 0°'2. 



The mean temperature of evaporafio7i at Greenwich — 



For the month of October was 44°'4 ; for November was 44°'5 ; 

 and for December was 39°'6. These values are 3°"6 less, l°-4 

 and 0°'5 greater than those of the averages of the same months 

 in the preceding nine years. 



The mean temperature of the dew-point at Greenwich — 



For the months of October, November and December, were 



'■ Commuuicateil by the Autlior. 



