Mr. J. Glaisher's Remarks on the Weather, 125 



The highest temperature of the air was about 69° at several 

 places; the lowest readings were 11° at Southampton, 15° at 

 Beckington and Chichester, and 15°'3 at Oxford, The ex- 

 treme range of temperature of the air during the quarter in 

 England was therefore about 58°. 



The average quarterly range of the reading of the thermo- 

 meter in Cornwall and Devonshire was 40°*7 ; at Liverpool 

 and Whitehaven was 48°-5 ; south of latitude 52° was 49°-2; 

 and north of this parallel was 4'5°*1. 



The mean temperature of the dew-point in Cornwall and 

 Devonshire was 44'°'1 ; south of latitude 52° was 41°*3; be- 

 tween the latitudes 52° and 53° was 40°* 1 ; and north of 53° 

 was 38°'7. 



The amount of cloud was such as to cover about three- 

 fourths of the sky nearly. 



Rain has fallen on the greatest number of days at Wake- 

 field, Holkham, Nottingham and Guernsey; the average num- 

 ber at these places was 61. It fell on the least number of 

 days at Saffron Walden, St. John's Wood, Hartwell Rectory 

 and Oxford ; and the average number at these places was 34. 

 The stations at which the largest falls have taken place are 

 Guernsey, Stonyhurst, Helston and Southampton. The 

 smallest falls occurred at St. John's Wood, Oxford, Stone 

 and London. The average fall in Guernsey, Cornwall and 

 Devonshire was 12*4 inches; south of latitude 52° was 6*9 

 inches ; between latitudes 52° and 53° was 7*6 inches ; between 

 53° and 54° was 10*2 inches; at Liverpool and Whitehaven 

 was 116 inches; and at Newcastle was 7*9 inches. 



The numbers in the columns 14 to 18 show the mean values 

 of the hygrometrical results ; from which we find that — 



The mean weight of vapour in a cubic foot of air at all 

 places (excepting Cornwall and Devonshire) in the quarter 

 ending December 31, 1849, was 3*0 grains. 



The mean additional weight required to saturate a cubic 

 foot of air was 0*5 grain. 



The mean degree of humidity (complete saturation = 1 ) 

 was 0-857. 



The mean amount of vapour mixed with the air would have 

 produced water, if all had been precipitated at one time on the 

 surface of the earth, to the depth of 3*6 inches. 



The mean weight of a cubic foot of air under the mean 

 pressure, temperature and humidity, was 543 grains at the 

 mean height of 182 feet. 



And these values for Cornwall and Devonshire were 3*5 

 grains; 0*6 grain; 0*864; 3*9 inches; and 540 grains, at the 

 average height of 122 feet. 



