488 PHILOSOPHY OF STORMS. 



place gone by." Now it would appear that Mr. Hopkins 

 here drew a deduction contrary to the evidence which he 

 himself furnishes in another paragraph, where it is said, 

 11 Glasgow the wind became fearful." 



As to the barometer continuing very low after the storm 

 passed on, this would easily be accounted for by the contin- 

 uation of bad weather, and the evolution of the latent caloric 

 during the condensation of the vapor into cloud. And as to 

 the fact that the wind was much more violent from the 

 westward in the latter part of the storm than at the begin- 

 ning it was from the eastward, this will generally be the 

 fact, as this is the direction of the wind in general, and es- 

 pecially if there had been a strong westerly wind just be- 

 fore the approach of the storm, which was the case in this 

 very storm. I have seen a letter of S. D. Sollet, Esq., a 

 highly respectable teacher of Hull, giving a minute descrip- 

 tion of the storm from personal observation, in which he 

 says, " the wind was still W. S. W. at eleven, P. M., but 

 got round to S. S. E., and at thirty minutes past two, A. M., 

 of the seventh, was a high gale, S. S. E., and blew off 

 about two hundred tiles from the top of his building, about 

 that time ; at four, the wind was south, very violent, and at 

 five, W. S. W., chimneys falling in every direction." 



As to the objection urged against Mr. Espy's theory, 

 " that at the time the barometer fell considerably, the tem- 

 perature, so far from diminishing as it would do if Mr. 

 Espy's theory were correct, absolutely increased;" it is 

 difficult to know what Mr. Hopkins means. 



He acknowledges what has long been known, " that a fall 

 in the barometer from diminished pressure, alone would 

 cool the air, equal to what it would be cooled, by rising to a 

 certain height in the atmosphere." 



This is demonstrated by experiment, therefore it is cer- 

 tain that the air was several degrees colder, on that memo- 

 rable night, when the barometer was at its minimum, than 



