Abstract
In opening the thermal part of this symposium I want to say a little about terrestrial heat‐flow, that is, the amount of heat which flows from the interior of the Earth and comes to its surface. We know at present very little about this quantity. Yet, if we are interested in calculating what temperatures exist at depths in the Earth greater than those which we can reach with a drill, it is necessary to know, among other things, how great this heat‐flow is. Later I shall mention some particular geophysical problems where heat‐flow measurements can give us information.

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