262 ABSTRACTS OF THE MAKERSTOUN OBSERVATIONS, 1843. 
In the following Tables, containing Daily Means, the places of the Sundays are occupied, as in the pre- 
vious Tables of Magnetical Observations, by the means of the three preceding and three succeeding days ; these 
means are considered as approximate weekly means, and have not been used in summations as approximate 
means for the Sundays. 
Different methods have been adopted in order to obtain good approximate daily means from the nine daily 
observations; these will be found described after the various Tables. Means obtained by these methods have 
been compared with the actual means where a complete series of two-hourly observations has been made, and 
they have been found to differ very little. 
In the following Tables, Spring has been considered as composed of the months of March, April, and May, 
and so on for the other seasons, 
TABLE I.—Daily, Weekly, and Monthly Means of the Temperature of the Air, as deduced from the 
Readings of the Dry Bulb Thermometer for 1843. 
January. | February.| March. April. : . : . |September.) October. | November. 
° i) ° ° 
40-6 s : : ; 4 61-0 ; 32.7 
35-8 : : : : rE 64-4 f 37.6 
29.2 ; ; : : 2 [59-1] : 36-7 
34.3 A : : : d : 55:3 i 47-6 
[35-2] : : : : é 54-0 ; [41-2] 
32.8 3 : P ; ; ¥ 5 46-7 
39-6 
39-8 
35-9 
35-2 
36-6 
[31-4] 
31-9 
COoOnNarP WH = 
[35-1] 
33-9 
33-3 
Mean 
The daily means, T, contained in Table I., were obtained from the nine daily observations as follows :— 
S$ being the sum of the nine observations, 18 the observation at 18, 10 at 10", then 
pTuSt 2x18 +10 
12 
For the first week in January, the mean of the observations at 20" and 5" was taken for the mean of the day ; 
and the second week, S being the sum of eight observations only, 3 x 20 was substituted for 2 x 18 in the pre- 
vious formula, 
