during the Qiiarter ending June SO, 18-1-9. 145 



and the least occurred at Truro, Liverpool, Guernsey, and 

 Whitehaven. 



The highest thermometer readings during the quarter were 

 88' at Southampton, 86° at Walworth, 85" at St. John's 

 Wood and at Latimer. The lowest thermometer readings 

 were 24° at Leicester, 24°'3 at Highfield House, and 25° at 

 Uckfieid and at Aylesbury. The extreme range of tempe- 

 rature of the air during the quarter in England was therefore 

 about 61°, considering the true extremes as 24° and 85°. 



The average quarterly range of the reading of the thermo- 

 meter in Cornwall and Devonshire was 43'*0 ; at Liverpool 

 and Whitehaven was 4l°*5; south of latitude 52° was 65°'5^ 

 and north of 52° was 51°-1. 



The mean temperature of the dew-point in Cornwall and 

 Devonshire was 43°'7 ; south of latitude 52° was 43°*5; be- 

 tween 52° and 53° was 42°'2, and north of 53° was 43°-6. 



The amount of cloud seems to have been less than usual. 



Rain has fallen on the greatest number of days at Hartwell, 

 Wakefield, and Cardington. The average number at these 

 places was 54. It fell on the least number of days at Maiden- 

 stone Hill, Hereford and Beckington, and the average num- 

 ber at these places was 33. The stations at which the largest 

 falls have taken place are Truro, Newcastle and Helston. 

 The smallest falls occurred at York, and generally in the north 

 of England. The average fall in the counties of Cornwall and 

 Devonshire was 8'1 inches ; south of latitude 52° was 6*4 

 inches; between the latitude of 52° and 53° was 7'4 inches; 

 between 53° and 54° was B'5 inches ; and at Newcastle and 

 Whitehaven was 7*8 inches. 



The numbers in the columns 1 5 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 June 30, 1849, was 3*5 grains. 



The mean additional weight required to saturate a cubic 

 foot of air in the quarter ending June 30, 1 849, was 0*9 grain. 



The mean degree of humidity (complete saturation = 1) in 

 the quarter ending June 30, 1849, was 0*776. 



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 4'2 inches. 



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

 pressure, temperature and humidity, was 532 grains at the 

 average height of 170 feet 



And these values for Cornwall and Devonshire were 3*5 

 grains; 0*9 grain ; 0*749 ; 43 inches ; and 534 grains, at the 

 average height of 120 feet. 



l*hil, Mag. S. 3. Vol. 35. No. 234. Aug. 1849. L 



