(hiring the Quarter ending June 30, 1848. 193 



on Friday night, the 30th of June, struck the potato haulm, 

 and did much damage to the peas." 



The approximate mean monthly values of the several sub- 

 jects of investigation are printed in the Registrar-General's 

 quarterly report, for the time or times of the day that the obser- 

 vations have been made. These numbers have been reduced as 

 follows : — First, for diurnal variations to deduce true monthly 

 values for each element; secondly, the reduced monthly mean 

 " elastic force of vapour " was taken from the reduced " baro- 

 meter readings ;" thirdly, the mean of these reduced monthly 

 values were then taken ; reducing that for the barometer to 

 the level of the sea, and in this way the subjoined quarterly 

 table was formed. 



From the numbers in the first column it seems that the 

 volume of dry air was the same at all parts of the country. 

 The mean of all these results is 29*554 inches, and this value 

 may be considered as the pressure of dry air for England 

 during the quarter ending June 30, 1848. 



From the numbers in the second column it seems that the 

 mean temperature of the air for the quarter ending June 30, 

 1848, in the counties of Cornwall and Devonshire, was 54°*1 ; 

 at places situated south of latitude 52° was 54 o, ; between 

 the latitudes of 52° and 53° was 53°*6 ; between the latitudes 

 of 53° and 54° was 52 o, ; and of Durham and Newcastle was 

 50°-7. 



The average daily range of the temperature of the air in 

 Cornwall and Devonshire was 15°*3 ; at Brighton, Liverpool 

 and Whitehaven, was 14 0, 9; south of the latitude of 52° was 

 21°-3; between the latitudes of 52° and 53° was 20 o, 3 ; be- 

 tween the latitudes of 53° and 54° was 19°'5; and of Durham 

 and Newcastle was 14°*9. 



The greatest mean daily ranges took place at Latimer, 

 Hartwell, Aylesbury, and Beckington respectively; and the 

 least occurred at Liverpool, Brighton, Whitehaven, and New- 

 castle respectively. 



The highest thermometer reading during the quarter was 

 at Leeds, which was 88°; and the lowest was also at Leeds, 

 viz. 23°. The extreme range of temperature in England 

 during the quarter was therefore 65°, but this is probably 

 somewhat too great. 



The average quarterly range of the reading of the thermo- 

 meter in Cornwall and Devonshire was 42 0, 5 ; at Brighton, 

 Liverpool, and Whitehaven, was 37°*7 ; at all other places, 

 except Beckington, Hartweli, Leeds and Wakefield, was51 0, 5. 



The direction of the wind has been so variable, that it is 

 not possible to determine its mean direction. Observers in 



