Mr Lawson on the Trade-Winds of Barbadoea. 383 



the existence of the trade-wind and NW. current in the at- 

 mosphere, the latter impinging on the earth's surface at 

 points over which the former did not extend (47, 60). 



81. At the northern extremity of St Lucia, the force of the 

 hurricane was greatest between 8 and 10 a.m., from which 

 time the wind veered round to east, and died away at south- 

 east. At the southern extremity of the island, the most 

 violent part of the storm was from the south-west ; and in 

 St Vincent, which lies next to the South of St Lucia, the 

 wind backed from NW. to W. atid SW.* 



82. If the directions of the wind at St Lucia, St Vincent, 

 and Barbadoes, at any given hour, be compared^ it will be 

 found that they do not agree with the rotatory theory. At 

 7 A.M. on the 11th August, for instance, the \vind at St Lucia 

 was NE., at St Vincent NW., and at Barbadoes SE. Now, 

 according to the rotatory theory, at the latter the wind 

 should have been about SW. by S., shewing a difference of 

 seven points, or 79° between the theoretical and true direc- 

 tions. 



83. In the accompanying diagram (fig. 3)^ Barbadoes, St 

 Lucia, and St Vincent, are laid down, and the direction of 

 the wind throughout the storm, supposing it to be composed 

 of different currents, as advocated in this paper. I have 

 assumed that the centre of the hurricane was a little more to 

 the south than Reid supposed, and that its tract, instead of 

 being WNW., as laid down by Redfield, was at first not 

 higher than W. by N. i N. The north-westerly wind at 

 Barbadoes, came " from the north-north-west and north 

 west" (70), it is projected in the diagram as NW. by N., 

 the intermediate point. The thick line shews the course of 

 the centre C of the storm, and its position is indicated for 

 every hour the dotted lines, parallel to it, pass through 

 Castries in St Lucia, and another point in the south of the 

 island, through Bridgetown in Barbadoes, and Kingston in 

 St Vincent, and by following either of these from west to east, 

 the changes of direction of the wind at each point, as the 

 gale passed over it, will be readily seen. These will be 



* Keid, p. 32-3. 



