The present time is harvest home for the prophets. The happy speculator in future sits on the piled-up wain, singing “I told you so,” with the submarine and the flying machine and the Marconigram and the North Pole successfully achieved. In the tumult of realisations it perhaps escapes attention that the prophetic output of new hopes is by no means keeping pace with the crop of consummations. The present trend of scientific development is not nearly so obvious as it was a score of years ago; its promises lack the elementary breadth of that simpler time. Once you have flown, you have flown. Once you have steamed about under water, you have steamed about under water. There seem no more big things of that kind available—so that I almost regret the precipitance of Commander Peary and Captain Amundsen. No one expects to go beyond that atmosphere for some centuries at least; all the elements are now invaded. Conceivably man may presently contrive some sort of earthworm apparatus, so that he could go through the rocks prospecting very much as an earthworm goes through the soil, excavating in front and dumping behind, but, to put it moderately, there are considerable difficulties. And I doubt the imaginative effect. On the whole, I think material science has got samples now of all its crops at this level, and that what lies before it in the coming years is chiefly to work them out in detail and realise them on the larger scale. No doubt science will still yield all sorts of big surprising effects, but nothing, I think, to equal the dramatic novelty, the demonstration of man having got to something altogether new and strange, of Montgolfier, or the Wright Brothers, or Columbus, or the Polar conquest. There remains, of course, the tapping of atomic energy, but I give two hundred years yet before that....