t24 A COMPARISON BETWEEN THE 



condition, and this is immediately absorbed by the air. The con- 

 sequence is, that the S. W. breezes, when they reach our shores, 

 bring with them the character of the locaHty whence they spring, 

 modified by the colder temperature they meet with. They are mild, 

 and, except in the summer, almost always saturated with vapour, i. e. 

 the temperature of the air and the dew-point are pretty nearly the 

 same. 



The following is a statement of the dew-point, in London, during 

 the summer quarter, with the wind N. E. and S. W. — 



Wind. Dew-Point. 



N. E 55.4° 



S.W 57° 



Here we see the effect that might be anticipated at this season. 

 The continued action of the sun for fifteen or twenty hours, in the 

 high northern latitudes, during summer, melts the snow, warms the 

 ground, calls forth a rapid vegetation exhaling large quantities of 

 moisture, and, consequently, we find our north-easterly winds 

 approaching very nearly to the character of the south-west, the 

 mean difference in the dew-point being only 1.6° In Malvern, 

 from its elevated site, the difference is rather greater — 



Wind. Dew-Point. 



N.E 53.3° 



S.W 56.0° 



In autumn, the effect of the sun's rapidly declining elevation, with 

 its certain concomitants — frost, snow, and a cessation of vegetable 

 vigour, begin to shew themselves in the increasing difference in the 

 dew-point of winds from this quarter compared with their south- 

 western antagonists. 



In London, for this quarter, the following is a statement of the 

 mean : — 



Wind. Dew-Point. 



N. E 45.6° 



S.W 50.8° 



Here, then, the difference increases from 1.6° during the summer 

 to 5.2 ' in the autumn. In Malvern the difference is as follows — 



Wind. Dew-Point. 



N.E 43.2° 



S.W 50.5° 



From these statements it results that S. W. winds are equally 

 damp in autumn both in London and Malvern, and there is only I ° 

 difference between them in the summer j whereas the north-easterly 

 •winds are drier in Malvern, both in summer and autumn, than they 

 are in London. 



RAIN. 



To conclude these remarks, it remains only to compare the num- 

 ber of days in which rain fell, in London and Malvern, during the 

 summer and autumn. The numbers below, for Malvern, include 

 all those days upon which it rained, whether much or little ; the 



