THE BAHAMA ISLANDS 



135 



of the year without the aid of an artificial wind, even by means of additional 

 kites. There is apparently a diminution of wind velocity above the elevation 

 of about 4000 feet, in this respect differing from the conditions in the tern- 



FIG. 4. Nassau, Bahama Islands. Record made on board the steam launch Alicia, 

 July 6, 1903, 11 a. m. to 1 p. m. 



perate latitudes, where the velocity steadily increases up to the limits thus far 

 attained. This supposition is also borne out by observations of the few 

 upper clouds seen during our stay of five or six weeks in these latitudes. A 

 few clouds of the upper layer were observed, but their slight northward motion 



