Abstract
Introduction—In the course of a systematic survey of the ground‐water resources of the Hawaiian Islands which is being made under the direction of H. T. Stearns of the United States Geological Survey in cooperation with the Territorial Government of Hawaii, it was found desirable to test the utility of geophysical methods in the solution of certain Hawaiian water‐supply problems. A cooperative geophysical survey for this purpose was undertaken by the Geophysical Section, then with the Bureau of Mines but later transferred to the Geological Survey, during the course of which a series of resistivity‐studies of certain salt‐water boundaries was begun. Since the location of such boundaries is of considerable importance in many areas it has been thought worth while to present the results which have thus far been obtained.

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