192 ANNUAL REPORT SMITHSONIAN INSTITUTION, 195 2 



Figure 3. — Tidel basins in the Atlantic Ocean. 



The waters of the Caribbean and the Gulf of Mexico are not in- 

 cluded within either of the Atlantic basins. The area in which these 

 waters lie is not of the proper length and depth to sustain the system 

 of oscillation of those basins. These waters are separated from the 

 larger basin by the islands and submerged reefs that extend from 

 Florida to the northeast coast of South America. They respond to 



