Prof. Dove's Outlines of a general Theory of the Winds, 229 



E. through SE. to S.; in the southern, the equatorial current, 

 appearing as a north wind, will change the polar current, 

 grown more or less easterly from E. through NE. to N. 



In the parallel D D w of the northern hemisphere, the va- 

 riation hitherto observed will consequently be upon the whole : 



N. NE. E. SE. S.; 



in the parallel d d M of the southern hemisphere, on the con- 

 trary, exactly the opposite : 



S. SE. E. NE. N. 



Air which flows from the equator towards the poles comes 

 from places having greater velocity of rotation to places 

 which move more slowly towards east. Hence follows : 



3. In the northern hemisphere a southerly wind in gra- 

 dually advancing passes through SW. and becomes more and 

 more westerly. 



4. In the southern hemisphere a northerly wind in gra- 

 dually advancing passes through NW. and becomes more and 

 more westerly. 



If D D, D„ D,„ 



E E, E„ E,„ 



F F, F„ K, 

 G G, G„ G,„ 



designate places of the northern hemisphere, of which those 

 in the parallel G (3r are the most southerly, and if the whole 

 bulk of air contained between D D //7 and G G //y is put in mo- 

 tion from south to north, an observer being in D D 7// , though 

 he will receive the air coming from E % nearly as south, will 

 feel that which proceeds from F F //7 more as SW., and that 

 from G G /y/ more as west. 



If in the same way, g g, g„g,„ 

 J J j J //J /// 



d d d d 

 / // /// 



designate places of the southern hemisphere, gg M being the 

 most northerly, and dc^the most southerly, and if the air 

 between both parallels is put in motion towards the south 

 pole, an observer being in d d tn , though he will receive the air 

 from e e as north, will observe, that from ff M more as NW,, 

 that from g g ttt more as W. 



A westerly wind in both hemispheres will have a retarding 

 influence upon new equatorial currents and fix them to relative 

 calm. The tendency towards the pole continuing, the phe- 

 nomena will always be repeated till new polar currents change 



