THIRTY-FIVE years ago the English Channel had not yet been crossed by air. Now the crossing of the Atlantic by airplanes is a commonplace. One of this war's sensations was the cross-Channel bombardment of England by flying bombs and rockets. If there is another world war, will the transatlantic flight of bomb and rockets become a commonplace also? There is every reason to believe so. The technical problems involved are not so great as those which had to be overcome by the men who invented and perfected the airplane. A few years from now it probably will have become technically possible to bombard the United States from European bases, and vice versa. And the nature of the bombs so carried may be, as we now have had confirmed to us, terrible beyond any previous imagining.