A great flash of the colors of the spectrum sent Parker reeling back. Dr. Friedrich von Stein had gone the way of the crumpled ball of paper.
There was a long moment of silence. Then Allen Parker found his wife in his arms, clinging to him.
"'Are not two prayers a perfect strength?'" she murmured, sobbing against his heart.
A HUNDRED MILES UNDERGROUND
cientists bidding their families good-by in the morning to drop fifty or a hundred miles underground in high speed elevators, there to undertake researches not possible nearer to the earth's surface, may be realities of the next decade or two if some wealthy individual or institution accepts the recommendation of Dr. Harlow Shapley, distinguished astronomer of Harvard, in a talk recently before the American Geographical Society.
The earth's interior, Dr. Shapley said, is the "third dimension" of geography. Exploration of the planet's surface soon must cease from lack of places to explore. Even the upper air is coming to be reasonably well known scientifically, thanks to instruments sent up with balloons and to the radio and other investigators who have been uncovering secrets of upper-air electricity. But the interior of the earth is still one of the great mysteries. It is a paradox of astronomy that much more is known about the center of the sun or a star like Sirius than about the center of the earth.
Deep shafts of bore holes into the earth have been suggested often as sources of heat for human use. It is doubtful, however, whether such heat supplies could be obtained. For one thing, the supposed internal heat of the earth is still nothing but a guess. It may be that the relatively slight increases of heat found as one goes deeper in existing mines are due to radioactivity in the rocks instead of to outward seepage from the internal fires. Another difficulty about utilizing earth heat is that heat moves so slowly through substances like rock, as any housewife can prove by trying to fry an egg on a brick placed over a gas flame. As soon as the rock heat immediately at the bottom of a bore hole had been exhausted heat supply would stop until more could diffuse in from the sides.
Dr. Shapley's suggestion, in any event, is not to search for heat but for facts. Even in existing, relatively shallow mines, he believes, scientific laboratories at different depths under the surface might yield valuable data not now obtainable. Most scientific men will agree. Revolutionary as the idea may seem to those familiar only with the standardized laboratories of physics or chemistry, there are sound reasons why a half-dozen or so of the sciences should do precisely what Dr. Shapley suggests.