162 ABSTRACTS FOR THE THERMOMETERS. 
TABLE IX.—Means of the Maxima and Minima of Temperature for periods of Three Months, &c. 
Mean of Daily Mean of Monthly 
Periods. 
: Max. and F 3 Max. and 
Min. ane Max. Min. an. 
1841. ° ° ° ° ° 
July, Aug., Sept. 47-9 54-9 . 72-3 38-2 55-2 
Oct., Nov. 34-5 40-2 54:8 22:3 38:5 
1842. 
Jan,, Feb., March 31-8 37-4 49-8 23-5 36-6 
April, May, June 40-6 51-0 715 30-8 51-1 
July, Aug., Sept. 48-6 56-9 77-0 37-2 57-1 
Oct., Nov., Dec. 37-5 42.9 59-6 24-6 42-1 
The Year 39-7 47-1 64-5 29-0 46-7 
The mean of the monthly maxima and minima for the third quarter of 1841, and for the second and third 
quarters of 1842, is 0°-2 greater than the mean of all the daily maxima and minima for the same periods. The 
mean of the monthly maxima and minima in the first and last quarters of 1842, is in each case 0-8 less than the 
mean of all the daily maxima and minima for the same periods. 
The mean of the maximum and minirnum in each month of 1842 is 0°.4 less than the mean of all the daily 
maxima and minima in 1842. 
TABLE X.—Monthly Means of the Pressure of Aqueous Vapour. 
Mean of the 
Month. 20%. 23, ; "i 
on Four Hours. 
1841. in. in. in. in. in. 
July : 0-357 
August . . . : 394 
September . : . . 381 
October : : : : 265 
November : : : : +220 
1842. 
January : : : : +196 
February : . : +25 +222 
March : ‘ : : +237 
April : : 275 . | +260 
May : ; 3 ; -333 
June : . : : -360 
Al uly : . + . -387 
August : “ . : 434 
September : : : : -370 
October : : : : +247 
November : . : : +231 
December : : : : 281 
In forming the above Table, only those observations of the dry bulb thermometer were used which had cor- 
responding observations of the wet bulb. 
In the computations, Dr Apjohn’s formula was used approximately, viz., f’=/" = ; 96 being substituted 
for 88 for temperatures below 32°. The values of /’ were taken from the Table page xi. Introduction to the 
Greenwich Meteorological Observations for 1842. 
