This thought of the ephemeral character of the poster as such has, in the first instance, prompted the publication of this volume. A poster serving the purposes of a war, even of such a world cataclysm as that during which we have passed during the last five years, is by its nature a creation of the moment, its business being to seize an opportunity as it passes, to force a sentiment into a great passion, to answer an immediate need, or to illuminate an episode which may be forgotten in the tremendous sequence of a few days' events. In its brief existence the poster is battered by the rain or faded by the sun, then pasted over with another message more urgent still. Save for the very limited number of copies that wise collectors have preserved, the actual posters of the Great War will be lost and forgotten in fifty years. But we must not forget that in every country concerned the poster played its part as an essential munition of war. Look through any collection of them, and you will see portrayed, in picture and in legend, which he who runs may read, the whole history of the Great War in its political and economical aspects. The posters of 1914-1918 illustrate every phase and difficulty and movement--recruiting for naval, military, and air forces; munition works; war loans; hospitals; Red Cross; Y.M.C.A.; Church Army; food economy; land cultivation; women's work of many kinds; prisoners' aid--and hundreds of problems and activities in connection with the country's needs. The same sequence of needs can be traced in the posters of Germany and Austria, where a stress even greater than our own is revealed, not merely in the urgent appeals for contributions to war loans, but in the sale by German women of their jewels and their hair. For obvious reasons only a limited number of the posters could be reproduced in colour, the main portion of the plates in the book being in black and white. But since the primary element counting for success in the poster is design, it follows that excellent colouring will not save a badly-designed poster from failure, however much it enhances the power of one already successful. Indeed, we may go further and claim that ineffective or quite bad colouring often fails to mar entirely the success of a good design. The examples selected are not heavy losers by being reproduced mostly in monotone; for they are essentially posters depending on design and not merely pictorial advertisements. Their purpose is innate in their structure; they have their story to tell and message to deliver; it is their business to waylay and hold the passer-by, and to impose their meaning upon him. The best of them have done this brilliantly. II.--GREAT BRITAIN