130 ON ATMOSPHERIC AND BAROMETRIC 



A sufficient number of facts has been collected 

 to enable us to show, that the sea and land 

 breezes do not blow at the times when it would be 

 expected that they should, through alterations that 

 are taking place in the atmosphere, as such altera- 

 tions are indicated by the movements of the barome- 

 ter. These breezes are said to blow invariably from 

 a part where the atmosphere is relatively heavy, 

 to another part where it is lighter ; we ought, 

 therefore, to find, that wherever the sea breeze 

 was blowing with increasing strength, the atmo- 

 sphere on the land towards which it was blowing, 

 was becoming lighter, and the barometer on the 

 land was falling. In like manner when the land 

 wind was blowing with increasing force, the 

 atmosphere must be supposed to be increasing 

 in weight over the land, which increase should be 

 measured by a rise of the barometer on the land. 



If, however, the movements of the barometer 

 do not accord with the times of these winds, but 

 that instrument sometimes rises when from the 

 direction of the wind, it should fall, and the 

 reverse, — we have to ask why this should occur ? 

 There must be some sufficient cause in operation 

 to produce these effects, so different from what is 

 expected from the nature of the influences sup- 



