136 Mr. J. Glaisher's Remarks on the Weather. 



From the numbers in the first column it appears that the 

 volume of dry air was very nearly the same at all parts of the 

 country. The mean of all the results in the first column is 

 29'G40 inches, and this may be considered as the pressure of 

 dry air for England during the quarter ending December 31, 

 1847. 



From the numbers in the second column we find, for the 

 quarter ending December 31, 1 847, that the mean tempera- 

 ture of the air for the counties of Cornwall and Devonshire 

 was 'J"8~*9, and for the remaining counties, excepting those 

 north of latitude 54°, was 45°-7, and that the mean tempera- 

 ture of Durham and Newcastle was 44°*8. 



The average daily range of the temperature of the air in 

 Cornwall and Devonshire was 8''-6 ; at Brighton and Liver- 

 pool was 6'^*4, and the mean value for all other places was 

 10^*5. The greatest mean daily ranges took place at Harl- 

 well, Cambridge, Latimer Rectory, Uckfield, &c., and the 

 least occurred at Brighton, Liverpool, Torquay, Truro, Nor- 

 wich, &c. 



The highest reading during the quarter was at Greenwich, 

 which was 73°*2, and the lowest was at Beckington, which 

 was 14°. The extreme range of temperature in England 

 during the quarter was therefore 59°*2. 



The average quarterly range of the thermometer-readings 

 in Cornwall and Devonshire was 35°'7 ; at Brighton and 

 Liverpool was 33°-6; at those places situated between the 

 latitudes of 51° and 52^°, was 44°-7 ; and between the latitudes 

 of 521° and 55° was 36°. The ranges at those places situated 

 at a high elevation, were in all cases much greater than at 

 those places situated in the same parallel of latitude but at a 

 lower elevation. 



The mean direction of the wind for all places v/as S.W., 

 except at Brighton, where it was N.E. 



From the numbers in the ninth column it would seem that 

 the distribution of cloud has been nearly the same at all parts 

 of the country, and such as to cover three- fourths of the whole 

 sky. 



The fall of rain has been the largest in Cornwall and De- 

 vonshire; the average amount for the quarter was 16 inches; 

 and it has fallen on a greater number of days in those coun- 

 ties than in any others; the average number was 54, but this 

 number was exceeded by 7 at Truro. At Torquay the num- 

 l)er was 43 only. At Walworth the fall seems to have been the 

 least in amount, but this value is not confirmed by those at 

 neighbouring places; the next in order is Cambridge, Lewis- 

 ham, Saffron Walden, Greenwich, Uckfield, Cardington and 



