44 RESULTS OF MAKERSTOUN OBSERVATIONS, 1845. 
TABLE IV.—Errors of the Approximate Mean Temperatures, deduced from one or two Daily 
Observations, for each Month, and the Year 1845. 
Approximate Means (+) greater, or (—) less than true Means. 
Months Mean =a] 
and || of 24 175 10™ | 21> 40m | 21h 49m] 22h 10m | 22h 10m | 17h 10m) 21h 10m 
Year. Hours. and and and and and and and 
4h 10™, | 102 10™,| 9h 40™, | 115 10™, | 104 10™, | 23" 10™.) 9h 10m, 
January 33-97 +0-23 | —0-37 | —0-47 | —0-02 | —0-02 . — 0-92 
February 33-35 +0-65 | —0-48 | —0-45 : — 0-05 . — 0-85 
March 35-07 —0-12 | —0-22 | —0-05 5 +0-18 o —0-27 
April 44.23 +0-67 | —0-91 | —0-53 ‘ — 0:38 : — 0-68 
May 46-45 + 0-20 0-00 - + 0-20 “ — 0-20 
June 55-92 — 0-02 . +0-25 . +0-03 ‘02 | +0-48 
July 54-00 . + 0-20 * — 0-08 . +0-05 . — 0-20 
August 54-67 +0-03 . +0-13 : + 0-23 D + 0:03 
September 49-81 —0-01 : +0-31 . + 0-69 . — 0-06 
October || 48-28 — 0-28 . — 0-23 . +0-12 . — 0-58 
November 42.02 . —0-17 ‘ — 0-25 . +0-13 . — 0-62 
December 37-57 — 0-42 . —0-15 : +0-08 . — 0:37 
Year | 44-61 40-08 | —0-28 | —0-13 | —0-10 | +0-10 
The 12 Months. 
Mean of Errors 0-25 . 24 | 0-18 
Range of Errors 1-09 . -27 | 1-07 
TABLE V.—Diurnal Ranges of Temperature, as deduced from the Hourly Observations of the 
Dry Bulb Thermometer, on each Civil Day of 1845. 
March. | April. May. June. A Sept. 
