By means of the above process we live in communication with other men of the present and of the past; and we must not conclude because we sometimes, and indeed often, meet with an unknown or an ill-known, that therefore, when we believe we are engaged in a dialogue, we are always speaking a monologue; or that we are unable even to repeat the monologue which we formerly held with ourselves. XVII THE HISTORY OF LITERATURE AND ART This brief exposition of the method by which is obtained the reintegration of the original conditions in which the work of art was produced, and consequently reproduction and judgement are made possible, shows how important is the function fulfilled by historical research in relation to artistic and literary works which is what is usually called _historical criticism_ or method in literature and art. [Sidenote: _Historical criticism in literature and art. Its importance._] Without tradition and historical criticism the enjoyment of all or nearly all the works of art produced by humanity would be irrevocably lost: we should be little more than animals, immersed in the present alone, or in the most recent past. It is fatuous to despise and laugh at one who reconstitutes an authentic text, explains the sense of forgotten words and customs, investigates the conditions in which an artist lived, and accomplishes all those labours which revive the qualities and the original colouring of works of art. Sometimes a depreciatory or negative judgement is passed upon historical research because of the presumed or proved inability of such researches, in many cases, to give us a true understanding of works of art. But it must be observed, in the first place, that historical research does not only fulfil the task of helping to reproduce and judge artistic works: the biography of a writer or of an artist, for example, and the study of the customs of a period, have an interest of their own, that is to say, extraneous to the history of art, but not to other forms of historiography. If allusion be made to those researches which do not appear to have interest of any kind, nor to fulfil any purpose, it must be replied that the historical student must often reconcile himself to the useful but inglorious function of a collector of facts. These facts remain for the time being formless, incoherent and meaningless, but they are preserves or mines for the historian of the future and for whosoever may afterwards want them for any purpose. In the same way in a library, books which nobody asks for are placed on the shelves and catalogued, because they may be asked for at some time or other. Certainly, just as an intelligent librarian gives the preference to the acquisition and cataloguing of those books which he foresees may be of more or better service, so intelligent students possess an instinct as to what is or may more probably be of use among the material of facts which they are examining; while others less