294 RESULTS OF THE METEOROLOGICAL OBSERVATIONS TAKEN DUEING 



after which the diiference between the year 1903 and the mean of the two years 1903 

 and 1904 was applied to the data under discussion. For example, the mean pressure 

 during the Spring months, September, October, and November, was 29-557 inches in 

 1903 and 29-618 inches in 1904, the mean of the two being 29-588. It is seen that 

 pressure during the Spring of 1903 was 0-031 inch loioer than the mean for the two 

 years, so that in dealing with the means obtained witli S.E. and E. winds during the 

 years 1903 and 1904 a correction of minus 0-031 inch was applied to the observed 

 values to make them comparable with the other directions which are based on the 

 year 1903 only. The same method was applied to all the seasonal values of pressure, 

 temperature, wind force, and cloud, as well as to the annual means. In this way a 

 much closer approximation to the true means for S.E. and E. winds has been obtained, 

 especially as these winds were much more frequent in 1904 than in 1903. (See Plate I.) 



Pressure axd Temperature. 

 The following table shows the mean barometric pressure with different winds during 

 the four seasons of the year : — 



Hence it will be seen that the highest pressure is recorded with winds from the 

 S.E. and the lowest with winds from the W. Except in winter, when the lowest 

 pressure is recorded with S.W. winds, the AV. has the lowest values, while the direction 

 of highest pressure is S.E. in Spring and Summer, S. in Autumn, and N.E. in Winter. 

 Except in Spring, when there is a range of 0-368 inch between the higliest and lowest 

 pressure, the seasonal difference is less than half the above amount. 



The following table shows the direct effect of the wind on the pressure, or the 

 difference from the mean, the heavy type indicating above the average and the italic 

 below : — 



