At the outset I want to acknowledge the splendid cooperation which I have received in the preparation of this report by the members of my committee. Their support has been most gratifying, and the information received from them on progress in our field in the last year is so complete that I doubt whether I can do justice to their contributions in the space allotted to the report. The year's activities in electrical, geothermal, radioactive, and soil analysis methods will be covered in this report in the order given. Each of these will be subdivided into applications in mining, oil exploration, engineering geology, and activities along scientific or theoretical lines.

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