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 town or arsenal it has covered. And a factor of primary value in this warfare, because of the importance of seeing the board, a factor which will be enormously stimulated to develop in the future, will be the aerial factor. Already we have seen the captive balloon as an incidental accessory of considerable usefulness even in the wild country warfare of South Africa. In the warfare that will go on in the highly-organised European States of the opening century, the special military balloon used in conjunction with guns, conceivably of small calibre but of enormous length and range, will play a conspicuously essential part. These guns will be carried on vast mechanical carriages, possibly with wheels of such a size as will enable them to traverse almost all sorts of ground. The aeronauts, provided with large scale maps of the hostile country, will mark down to the gunners below the precise point upon which to direct their fire, and over hill and dale the shell will fly—ten miles it may be—to its billet-camp, massing night attack, or advancing gun. Great multitudes of balloons will be the Argus