34 



6th. When the barometer falls suddenly in the western part of New 

 England, it rises at tlie same time in the valley of the Mississippi, and also 

 at St. John, Newfoundland. 



7th. In great storms, the wind, for several hundred miles on both sides 

 of the line of minimum pressure, blows towards that line directly or ob- 

 liquely. 



8th. The force of the wind is in proportion to the suddenness and 

 amount of the barometric depression. 



9th. In all great and sudden depressions of the barometer, there is much 

 rain or snow; and in all sudden great rains or snows, there is a great fluc- 

 tuation of the barometer. 



10th. Many storms are of great and unknown length from north to 

 south, reaching beyond our obsen^ers in the gulf of Mexico, on the one 

 hand, and beyond the northern lakes on the other, while their east and west 

 diameter is comparatively small. The storms, therefore, move side- 

 foremost. 



11th. Most storms commence in the '.' far west," beyor>d the stations of 

 our most western observers; but some commence in the United States. 



12th. When a storm commences in the United States, the hne of mini- 

 mum pressure does not come from the " far west,' ^ but commences with 

 the storm, and travels with it towards the east. 



13th. There is generally a Lul) of wind at the lineof mimmem pressure, 

 and sometimes a calm. 



14th. When the wind changes to the west, the barometer begins to rise. 



15th. There is generally but little wind near the line of maximum pres- 

 sure, and on each side of that line the winds are irregular, but tend out- 

 wards from that line. 



16th. The fluctuations of the barometer are generally greater in the 

 northern than in the southern parts of the United States. 



17th. The fluctuations of the barometer are generally greater in the 

 eastern than in the western parts of the United States. 



]8th. In the northern parts of the United States,, the wind, in great 

 storms, generally sets in from the north of east, and terminates from the 

 north of west. 



19th. In the southern parts of the United States the wind generally sets 

 in from the south of east, and terminates from the south of west. 



20th. During the passage of storms the wind generally changes fronj 

 the eastward to the westward by the south, especially in the southern parts 

 of the United States. 



The importance o^ verifying, modifying, or refuting these generaliza- 

 tions; will appear more fully by a consideration of the following theory ;^ 



i 



