140 



MR. J. BAXENDELL ON METEOROLOGICAL 



changes of solar activity upon the distribution of baro- 

 metric pressure, temperature, and rainfall under different 

 winds, the above table (p. 139) was divided into two — the 

 first comprising the results for the five years 1858-62, 

 when the number of solar spots was above the average, 

 and the second those for the six years 1863-68, when the 

 number of spots was below the average. The means of 

 the numbers under each wind in both tables were then 

 determined; and a comparison of the two sets of results 

 thus obtained showed, for each element, the nature of the 

 changes which had taken place. 



Barometric Pressure. 



The mean pressures under different winds for the two 

 periods, and their differences, are as follows : — 





Mean pressure, 

 1858-62. 



Mean pressure, 

 1863-68. 



Difference. 



N 



in. 



29-859 



29890 



29-791 



29-672 



29-635 



29-604 



29-684 



29.810 



in. 



29-849 



29-801 



29-728 



29-615 



29652 



29-719 



29-789 



29-805 



in. 

 +0*010 

 +0-089 

 +0*063 

 +0*057 



— 0*017 



— 0*115 



— 0*105 

 +0*005 



N.E 



E 



S.E 



S 



S.W 



W 



N.W 





It appears, therefore, that in the years of maximum 

 solar-spot frequency the maximum barometric pressure 

 took place under north-east winds, and the minimum 

 under south-west; but in years of minimum frequency 

 the maximum and minimum pressures occurred respec- 

 tively under north and south-east winds. The difference 

 of pressure under north-west winds is almost inappreciable ; 

 and the differences under north and south winds are small; 

 but those under north-east, east, south-east, south-west, 

 and west winds are too considerable to be fairly attri- 



