dtiriiig the Quarter ending March 31, ISiS. 507 



For the month of February was 43°'4, which is 2°'6, 7"-4, 

 8^-2, 10'^-7 above those of the years 1842 to 1845 respectively, 

 0-5 below that in 1846, and 8^'0 below that of 1847; or it is 

 2^'6 above the average of these six years. 



For the month of March was 43°*8, which is 1-1 beloiso 

 that of 1842, O'-Q, 2°-3, S^-e, 0^*5 and 2°-8 rt^>ot;^ those of the 

 years 1843 to 1847 respectively; or it is 2°-3 above the ave- 

 rage of these six years. 



The mean value for the quarter was 40"-6; that for 1841 

 was 38^-4 ; for 1842 was S9''-5 ; for 1843 was 39°-6 ; for 1844 

 was 38''-5; for 1845 was 35--4 ; for 1846 was 43^-6; and for 

 1847 was 37°'2; so that the excess for this quarter above the 

 corresponding quarter in the years 1841, 1842, 1843, 1844, 

 1845 and 1847, were 2°-2, 1°-1, 1^-0, 2°-l, 5°-2, and 3°-4 re- 

 spectively; the only year between 1841 and 1847 whose mean 

 temperature for this period exceeded that of the present year 

 was 1846; the excess of the period in this year exceeded that 

 of the corresponding period of 1848 by 3°'0. The average 

 value for this quarter from the seven preceding years was 

 38°*9, so that the mean temperature of the air for the past 

 quarter exceeds that of the corresponding quarter in the seven 

 preceding years by 1°"7. This excess is remarkable, from 

 the circumstance of the mean temperature of the preceding 

 quarter being in excess to the large amount of 3°'4, so that 

 the temperature of the period between 1847, September 30, 

 and 1847, March 31, exceeds the average by 2'^'55. 



The 7nean temperature of tJie evaporation at Greenwich — 



For the month of January was 32"'6, which is 4°*7 below 

 that for the preceding six years. 



For the month of February was 41°'6, which is 5°*8 above 

 that for the preceding six years. 



For the month of March was 41°'6, which is 2'''2 above 

 that for the preceding six years. 



The mean value ibr the quarter was 38°'6, which is l^'l 

 above that for the corresponding period of the preceding six 

 years. 



The mean temperature of the dew-point at Greenwich — 



For the month of January was 31°*7, which is 1°*7 above 

 that for 1842, 5°'6, 4°'4, 4'-2, 9^-1, and l°-9 i<?/oio those of 

 the years 1843 to 1847 respectively; or it is 3"*9 below the 

 average of these six years. 



For the month of February was 38''-8, which is 0''-4, 5°-4, 

 7°-0, 10 '-3 above those of the years 1842 to 1845, 1°-1 below 

 that of 1846, and 7''-8 above that of the year 1847 ; or it is 5°-0 

 above the average for these years. 



For the montl> of March was 38°-5, which is 2°-2 and O"'* 

 below those of tiie years 1842 and 1843, \°-9, 8°-5, 0°'2, and 



