41(! 



Results of Makekstoun Observations, 1844. 



Diurnal Range of the Hourli/ Means of the Tension of Aqueous Vapour. — The followring are the ranges of 

 the hourly means for each month of 1844 : — 



Jan. Feb. ftlarch. April. May. June. July- Aug. Sept. Oct. Nov. Dec. 



in. in. in. in. in. in. in. in. in. in. in. in. 



0-031 0-021 0-029 0-044 0-042 0-056 0-050 0052 0-061 0-041 0-015 0-015 



The diui-nal range is greatest in September and least in November and December. The diurnal ranges 

 for each of the astronomical quarters and for the year are — 



in. in. in. in. in. 



0029 



Winter, 0-018 Spring, 0029 Summer, 0-046 Autumn, 0-048 Year, 0-033 



The Extremes of Daily 3Iean Pressure and their Ranges for each month are as follow : — 

 Jan. Feb. March. April. May. June. July. Aug. Sept. Oct. 



Greatest, 0-311 

 Least, 0-147 



0-263 0-298 0-355 0-336 0-466 +0-489 0-420 

 ■ 0126 0-151 0-197 0-188 0-285 0-303 0-271 



0-479 0-336 

 0-253 0-215 



Nov. 



in. 



0-340 

 0185 



Dec. 

 in. 



0-237 

 0-136 



Rani<e, 0-164 0-137 0-147 0-158 0-148 O'lSl 0186 0149 +0-226 0-121 0-155 -OLOl 



The ma.ximum and minimum of daily mean pressure for the year are indicated by + and — and the greatest 

 and least monthly ranges of the daily means are similarly marked. 



Relative Humidity. 



TABLE XIV.— Mean Relative Humidity for each Civil Day, Week, and Month of 1844, 



Saturation being = 1. 



