264 ABSTRACTS OF THE MAKERSTOUN OBSERVATIONS, 1843. 
If we apply a correction to the monthly means, Table I., for the Sunday means awanting, which may be 
derived with sufficient accuracy from a comparison of the monthly means from the self-registering thermometers, 
when the Sundays are included and omitted, we obtain the true means for 1848 as follow :— 
Jan. Feb. March. April. May. June. July. August. Sept. Oct. Nov. Dec. 
38°4 338°0 3993 44°9  46°7 51°8 56°8 57°2 55°F  49°8  39%4 '45°4 
Winter, 39°-0 ; Spring, 43°°6; Summer, 553; Autumn, 46°0. 
Mean Temperature for the year 1843 = 46°05. 
It is evident that, for the year 1843, the months of January, February, and March constitute the meteoro- 
logical season, Winter; and July, August, and September constitute Summer. The means for this mode of 
grouping are— 
Jan., Feb., March, 36°:9; April, May, June, 47°-8; July, August, Sept., 56°6; Oct., Nov., Dec., 425. 
TABLE I1i—Mean Temperature of the Air at the Observation Hours for each Month and 
Quarter of 1843. 
a ee ee 
Period. 18%, 20%, 22h, Ob, oh, 4h, 6h. 8h, 104, Mean. Range. 
° Fie | pore CP ea PaO io Sa Sela ce Gian 
January 38-10 | 37-81 | 38-07 | 39-80 | 40-60 | 40-05 | 39-30 | 38-54 | 38-07 38-72 2.79 
February 31-85 | 31-99 | 32-66 | 34-94 | 35-74 | 35-20 | 33-35 | 32:18 | 32-05 32.98 3-89 
March 34-84 | 35-85 | 39-22 | 43-07 | 44-76 | 44-64 | 42-08 | 38-84 | 37-91 39-07 9-92 
April 39-26 | 42-70 | 47-32 | 49-47 | 50-76 | 50-17 | 47-44 | 44-15 | 42-40 || 44-55 11-50 
May 42:10 | 45-18 | 48-45 | 50-62 | 51-47 | 50-98 | 49-80 | 47-13 | 44-47 || 46-57 9-37 
June 48:35 | 51-00 | 53-41 | 55-05 | 55-92 | 56-25 | 55-47 | 52-99 | 49.24 || 51-97 7:90 
July 52-13 | 56-33 | 59-73 | 61-28 | 62-41 | 61-30 | 59-66 | 56-67 | 54-10 56-83 10-28 
August 50-10 | 54-26 | 59-46 | 63-13 | 64-91 | 64-76 | 62-25 | 57-92 | 55-25 57-29 14-81 
September 47-80 | 50-96 | 56:56 | 61-77 | 64-24 | 64-10 | 60-80 | 55-50 | 52-63 55-22 16-44 
October 39-12 | 39-S8 | 43-60 | 47-01 | 47-77 | 47-07 | 43-32 | 40-95 | 40-17 || 42-27 8-65 
November 38-22 | 38-68 | 39-93 | 42-30 | 43:33 | 42.03 | 39-15 | 38-49 | 38-24 || 39-59 5-11 
December 44-40 | 44-44 | 45-98 | 46-85 | 47-35 | 46-28 | 45-07 | 44-77 | 44-59 || 45-26 2-95 
Spring 38-73 | 41-24 | 45-00 | 47-72 | 49-00 | 48-60 | 46-44 | 43-37 | 41-59 || 43-40 10-27 
Summer 50-19 | 53-86 | 57-53 | 59-82 | 61-08 | 60-77 | 59-13 | 55-86 | 52-86 || 55-36 10-89 
Autumn 41-71 | 43-17 | 46-70 | 50-36 | 51-78 | 51-07 | 47-76 | 44-98 | 43-68 | 45-69 10-07 
Winter 38-12 | 38-08 | 38-90 | 40-53 | 41-23 | 40-51 | 39-24 | 38-50 | 38-24 || 38-99 3-15 
The Year 42-19 | 44-09 | 47-03 | 49-61 | 50-77 | 50-24 | 48-14 | 45-68 | 44.09 | 45-86 8-58 
In obtaining the means for the month of January, the observations in the first week were rejected ; no 
observation having been made at 18" in the second week, a correction was applied to the mean for that hour f 
of — 3°29, obtained from Table I. as follows :— 
{Mean temp., Jan. 9—31 = 40°32 minus, mean temp., Jan, 16—31 = 43°81} = — 3°29. 
The means were afterwards corrected by —0°-9, in order to render the mean for the month similar to that 
obtained, Table I., from the whole month. 
Diurnal Variation of Temperature—The period of minimum temperature is not indicated by the above 
observations. The maximum temperature occurs nearly at the following periods in the means for the four 
meteorological seasons :— 
Spring, maximum temperature, occurs at 12 30™ p.m. Makerstoun mean time. 
Summer) > +, avscleae eee tsnteeee es 1B Ab Met aeatea decease gihsthian tess 
AtGUMN,. ~i¢ istsesuseetens eats races LEGO lone oe eae ee cee 
Pitas 9 tS hen GV Aen Tag tee ne wen eer ant 
The Year, ..... or eae meer Here J BOM hee Sek Pee ea 
If we examine the monthly means separately, it will be found that the maximum occurs about the same 
time, namely, 1 10™ in the months of January, February, May, July, October, November, and December, 
