130 



ON THE STORM EXPERIENCED THROUGHOUT THE UNITED STATES 



made for difference of longitude, which would increase this velocity by about 

 one twenty-fifth part. The form of these curves for the north-west part of the 

 United States rests mainly upon the thermometric observations to be described 

 presently. The front of this wave appears, in many places, decidedly convex, 

 to an amount much beyond the possible errors of observation. 



Having thus discovered the form and velocity of the wave, let us attend to 

 the amount of the depression of the barometer. The following table exhibits 

 the difference between the barometric minimum and the subsequent maxi- 

 mum, the observations being arranged in the order of latitude. 





Latitude. 



Bar. Range. 





Latitude. 



Bar. Rangk. 



Indian Key, . . 



24° 48' N. 



.26 nich. 



Twinsburgh, . 



41 



18 



.68 nich. 



Pensacola, . 







30 28 



.46 



New Haven, . . 



41 



18 



.98 



Natches, 







31 34 



.79 



New Bedford, . 



41 



38 



1.02 



Savannah, . 







32 5 



.65 



Do. 



«i 



(( 



.97 



Bermuda, , 







32 34 



.41 



Boston, . . , 



42 



21 



.92 



Lexington, 







38 6 



.96 



Albany, 



42 



39 



1.173 



Washington, 







38 53 



.98 



Syracuse, . . 



43 



1 



.95 



Baltimore, . 







39 17 



1.02 



Rochester, . . 



43 



8 



1.03 



Marietta, . 







39 25 



.98 



Hanover, . . . 



43 



41 



1.14 



Springfield, 







39 53 



1.00 



Gardiner, . 



44 



10 



1.00 



Philadelphia, 







39 57 



.97 



Halifax, 



44 



39 



.52 



New York, 







40 43 



.97 



Montreal, . . . 



45 



31 



1.266 



Flushing, . 







40 45 



1.042 



Quebec, . • . 



46 



49 



1.57 



Sunbury, . 







40 53 



1.00 



St. Johns, . . . 



47 



34 



.85 



It will be observed that the range of the barometer increases generally with 

 the latitude. A more particular consideration of the subject, however, is de- 

 ferred for the present. I come, therefore, to consider, 



II. The movement of the thermometer. 



The movement of the thermometer during the period in question was quite 

 as remarkable as that of the barometer, and generally in the opposite direction. 

 Thus, while the barometer was falling under the influence of the storm, the 

 thermometer was every where rising; and as the barometer rose the thermo- 

 meter fell with extraordinary rapidity. It is not thought necessary to insert 

 here all the observations which have been collected. The following, being 

 about half the whole number, are selected as being, from their distribution, a 

 f^ir representative of the whole. 



