Art, in our society, has been so perverted that not only has bad art come to be considered good, but even the very perception of what art really is has been lost. In order to be able to speak about the art of our society, it is, therefore, first of all necessary to distinguish art from counterfeit art. There is one indubitable indication distinguishing real art from its counterfeit, namely, the infectiousness of art. If a man, without exercising effort and without altering his standpoint, on reading, hearing, or seeing another man’s work, experiences a mental condition which unites him with that man and with other people who also partake of that work of art, then the object evoking that condition is a work of art. And however poetical, realistic, effectful, or interesting a work may be, it is not a work of art if it does not evoke that feeling (quite distinct from all other feelings) of joy, and of spiritual union with another (the author) and with others (those who are also infected by it). It is true that this indication is an _internal_ one, and that there are people who have forgotten what the action of real art is, who expect something else from art (in our society the great majority are in this state), and that therefore such people may mistake for this æsthetic feeling the feeling of divertisement and a certain excitement which they receive from counterfeits of art. But though it is impossible to undeceive these people, just as it is impossible to convince a man suffering from “Daltonism” that green is not red, yet, for all that, this indication remains perfectly definite to those whose feeling for art is neither perverted nor atrophied, and it clearly distinguishes the feeling produced by art from all other feelings. The chief peculiarity of this feeling is that the receiver of a true artistic impression is so united to the artist that he feels as if the work were his own and not someone else’s,—as if what it expresses were just what he had long been wishing to express. A real work of art destroys, in the consciousness of the receiver, the separation between himself and the artist, nor that alone, but also between himself and all whose minds receive this work of art. In this freeing of our personality from its separation and isolation, in this uniting of it with others, lies the chief characteristic and the great attractive force of art. If a man is infected by the author’s condition of soul, if he feels this emotion and this union with others, then the object which has effected this is art; but if there be no such infection, if there be not this union with the author and with others who are moved by the same work—then it is not art. And not only is infection a sure sign of art, but the degree of infectiousness is also the sole measure of excellence in art. _The stronger the infection the better is the art, as art_, speaking now apart from its subject-matter, _i.e._ not considering the quality of the feelings it transmits.