372 Mr Lawson on the Trade-IVinds of Barbadoes, 



wards (64), now meeting with less resistance to the west- 

 ward, will commence to flow towards the line of least pres- 

 sure (as at D, iig. 2), their direction becoming at first ENE., 

 a little more to the SE., and still farther to the south the south- 

 erly motion will be checked, and they will appear to come 

 from ESE. These portions of air, having already had a rapid 

 motion, and flowing now from a point where they are under 

 a considerably greater pressure than at that to which they 

 move, will have their velocity very much increased, and join- 

 ing to the current already flowing along the earth's surface, 

 will tend to accelerate it. Here, as on the northern and 

 western sides of the storm, too, the more quiescent lower 

 stratum will, after a little, under the inequality of superin- 

 cumbent pressure within and around the storm, gradually 

 flow inwards towards its centre (55), so that, at a point com- 

 pletely to the eastward of that at which the storm com- 

 menced, a considerable fall of the barometer might occur, 

 without any other remarkable circumstance than a moderate 

 acceleration of the trade-wind, and a slight veering towards 

 the south. 



58. That portion of the trade which was to the eastward 

 of the line of least pressure, having thus been gradually 

 drawn from its original north-easterly direction to an easter- 

 ly one, it is clear that a triangular space to the SE. (A, C, E, 

 Fig. 2), comprised between the original direction and the 

 new one, the apex being at the point of junction of the ori- 

 ginal and deflected portions of the current (C, Fig. 2), will be 

 in a great measure deprived of its supply of air from the 

 northward. When the diff*erence of pressure over the outer 

 part of this space, and at the point C, becomes sufficiently 

 great, the air will flow towards that point, and the baro- 

 meter will fall all over it. But here, as elsewhere, the 

 higher portions of the air will first flow towards C, while 

 those on the earth's surface may remain at rest, or retain a 

 slight motion from the NE., until the difference of pressure 

 has become very great. 



59. While these changes have been taking place in the 

 lowest current in the atmosphere, others have been simulta- 



