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By deep electrical prospecting is meant depths of a half mile or more. Most data so far published refer to depths appreciably shallower than this. A continuous current field is most satisfactory together with electrode spacing comparable with the depth of the insulating media. Electrical prospecting is here regarded in the light of its ability to determine the presence of insulating rather than conducting media. Use is made of resistivity determinations at various electrode spacings together with inductance and resistivity slope functions. Inductance is determined by measuring the time constant of the current decay. Three areas are considered. One, the Hugoton gas area, Stevens County, Kansas, is an ideal case for the electrical method. In the other two cases considered, he Hebbronville area, Jim Hogg County, Texas, and the Anderson County, Kansas, area, the electrical method is quite ineffectual.
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