THE METEOROLOGY OF EDINBURGH. 



85 



Jan. Feb. 



Ins. Ius. 



29-813 29-743 



Mar. 

 Ins. 



29-778 



Apr. 

 Ins. 

 29-944 



Mean Pressure, 5 Years. 



May 

 Ins. 

 29-967 



June. 



Ins. 



30-021 



July. 



Ins. 



29-923 



Aug. 



Ins. 



29-913 



Sept. 

 Ins. 



29-840 



Oct. 

 Ins. 



29-876 



Nov. 



Ins. 



29-961 



Dec. Year. 



Ins. Ins. 



29-749 29-877 



Temperature. 



The thermometer was placed along with the hygrometer in a perforated case freely 

 exposed to the air on the outside of a window facing north. As the observer says, 

 " neither the sun, or rain, nor the fire and company in the chamber can have any bad 

 effect on the instruments within it, and the air has open free access to them." * The 

 instrument was filled with alcohol, and graduated into inches and tenths. " The freez- 

 ing point is at 8 inches and 2 tenths, and the heat of a man in health raises the spirit 

 to 22 inches 2 tenths." The conversion of the values to Fahrenheit's scale is thus 

 rendered an easy matter, as a change of 14'0 inches in the reading of the thermometer 

 is equivalent to an alteration in temperature of 66°'6, the normal blood heat being 98°'6. 

 The highest temperature recorded during the five years under consideration was 78° at 

 6 p.m. on June 30, 1734 (New Style), and the lowest, 19°"5 at 9 a.m. on January 8, 1732 

 (New Style), thus giving an extreme range of 58° "5 at the hours of observation. The 

 following are the highest and lowest temperatures recorded during the five years. 





Jan. 



Feb. 



Mar. 



Apr. 



May. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 





° 



o 



= 



• 



o 



» 



o 



o 



o 



o 



° 



• 



Highest, 



51-5 



50-5 



64 5 



64-5 



70-5 



78-0 



73-5 



76-0 



64-5 



62-5 



49-5 



54-0 



Lowest, 



22-0 



22-5 



28-0 



33-5 



36-5 



41-5 



49-5 



48-5 



40-0 ' 



31-5 



27-0 



195 



Range, 



29-5 



28-0 



36 5 



31-0 



34-0 



36-5 



24-0 



27-5 



24-5 



31-0 



22-5 



34-5 



In the reduction of the observations, for the purpose of obtaining mean monthly 

 values, the morning reading was alone employed. The 9 a.m. values were accordingly 

 extracted and averaged, Table XL VII. containing the corrected means for the five 

 years. 



Table XLVIII. contains the observations brought to the mean of the maximum 

 and minimum, the corrections being found from a comparison of the 9 a.m. readings 

 with the mean temperature deduced from the average of the maxima and minima, for 

 the years 1888-1896. The following are the monthly corrections thus obtained after 

 smoothing the curve : — 



Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. Year. 



+ 0°-6 +0°-8 +0°-7 -0°-0 -0°-4 -0°*2 -0°-0 + 0°-2 +0 o, 3 + 0°-3 + 0°-4 +0°-3 + 0°-2 



* Medical Essays, vol. i. p. 8. 



