Mr Lawson on the Trade-Winds at Barbadoes. 153 



9 E., fine, with a current from NE. above ; at 3 P.nr. E., fresh, 

 with the SSE. current over it. On the moon passing the 

 inferior meridian, early on the morning of the 17th, her de- 

 clination was about 12° S., and, consequently, the point to 

 which she tended to accumulate the atmosphere 12° N., very 

 nearly the latitude of Barbadoes ; that island, therefore, must 

 have been close to the centre of the accumulation. On the 

 temperature of the air increasing after sunrise, the tendency 

 to the formation of an ascending current, along the polar mar- 

 gin of the accumulation (37), would again be produced ; but 

 the centre of that being near the island, and an ascending 

 current being produced at its equatorial margin also, the air 

 at Barbadoes would flow to whichever side the amount of the 

 forces acting on it was greatest. That, in the present case, 

 was evidently the south ; for the attraction of both sun and 

 moon came into play in this direction, in addition to the in- 

 draught to the same point, caused by the heat of the former. 

 Accordingly, on the morning of the 17th, at 9 A.M., the wind 

 had backed from E. to NE., and it freshened considerably as 

 the day advanced, but again declined somewhat in the evening. 

 The moon, on passing the lower meridian with a southerly 

 declination, brought the wind to E. at 5 A.M. on the 18th, 

 while there was a decided SSE. current above it. The back- 

 ing to NE. was again perceptible at some elevation at 9 A.M. ; 

 and the freshening, as the day advanced, just as had been the 

 case on the preceding day, though the wind remained at E. 



39. From the 10th to the 21st, the sun's declination was 

 about 1° N. The moon's declination increased from 24° to 

 27° S., and her hour of transit varied from 3^ 31"^ F.M. to 5^ 

 17"' P.M. The wind on the 19th, at 9 A.M., was SE„ fresh, 

 with a current from E. above ; at 3 P.M. it was ENE., slight ; 

 and at 9 N., very slight. On the 20th, at 5 A.M., it was 

 ENE., slight, with a current above from SSE.; at 9 E., 

 fine, with a current above from S. ; at 3 P.M. SE., with cur- 

 rents above from ENE. and SE. ; and at 9 NE., very slight. 

 On the 21st it was NE., slight, at 5 a.m., with a current 

 above from SSE. ; at 9 SE., fine ; at 3 p.m. SE., do., with 

 currents from NE. and SSW. above ; and at 9 again NE., 



