Between February 13 and March 19, 1939 the "E. W. Scripps," research vessel of the Scripps Institution of Oceanography occupied fifty-three oceanographic stations in the Gulf of California. On the basis of observations of temperature and salinity which were taken at every station at a series of depths a chart of the dynamic topography of the surface relative to the 1500-decibar surface was derived, but this chart does not indicate any regular exchange of water between the Gulf and the adjacent part of the Pacific....