Wilhelm Ostwald,
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(1911)
“ Now we stand at the threshold of a third period, when man is making the gaseous part of our world accessible to us. There is no doubt that this signifies a new epoch of civilization. Hitherto we all lived a bi-dimensional existence on a surface. Henceforth the third, the spacial, dimension will come more and more to be the arena for man to move upon. ”
