Prof. Dove's Outlines of a general Theory of the Winds. 355 



3. The elasticity of the va- 3. The elasticity of the va- 

 pour increases with E., SE. pour increases with E., NE. 

 and south winds, its increase and north winds, its increase 

 changes with SW. into de- changes with NW. into de- 

 crease, it decreases with W., crease, it decreases with W., 

 NW, and north winds, and SW. and south winds, and 

 with NE. its decrease changes with SE. its decrease changes 

 into increase. into increase. 



4. The pressure of the dry 4. The pressure of the dry 

 air decreases with E., SE. air decreases with E., NE. 

 and south winds, its decrease and north winds, its decrease 

 changes with SW. into in- changes with NW. into in- 

 crease, it increases with W., crease, it increases with W., 

 NW. and north winds, and SW. and south winds, and 

 with NE. the increase changes with SE. its increase changes 

 into decrease. into decrease. 



What both hemispheres possess in common consists in this, 

 that the variations of the meteorological instruments are the 

 same for east winds in the northern hemisphere as for east 

 winds in the southern hemisphere. The same is the case with 

 the west winds. The difference of both hemispheres is only 

 quantitative with NW. NE. SW. and SE. winds; qualita- 

 tive, on the contrary, with north and south winds ; i, e. the 

 variations of the meteorological instruments are on an average 

 in the northern hemisphere greatest with NE. and SW. winds, 

 smallest (by compensation of the opposite motions) with NW. 

 and SE. winds ; in the southern hemisphere smallest (by com- 

 pensation of the opposite motions) with NW. and SE. winds; 

 greatest on the contrary with NE. and SW. winds. The 

 variations with north winds in the northern hemisphere are 

 however, according to the sign, different from the variations 

 with north winds in the southern hemisphere under equal 

 climatic influences, but, according to the magnitude, are the 

 same in both. If therefore an instrument in the northern 

 hemisphere rises with N., it falls with N. in the southern, and 

 vice versa. This applies also to the south winds. 



The proof of the positions above-stated for the northern 

 hemisphere are scattered here and there in separate memoirs ; 

 I will here bring them again together in order to have a bet- 

 ter general view of them. The confirmation or refutation of 

 the positions given for the southern hemisphere must be set 

 aside until made known by journals of observation. 



( + ) signifies rising, (— ) signifies falling. 



1. The barometer falls with E., SE. and south winds, passes 



2Z2 



