It is the art of music which most completely [139] realises this artistic ideal, this perfect identification of matter and form. In its consummate moments, the end is not distinct from the means, the form from the matter, the subject from the expression; they inhere in and completely saturate each other; and to it, therefore, to the condition of its perfect moments, all the arts may be supposed constantly to tend and aspire. In music, then, rather than in poetry, is to be found the true type or measure of perfected art. Therefore, although each art has its incommunicable element, its untranslatable order of impressions, its unique mode of reaching the "imaginative reason," yet the arts may be represented as continually struggling after the law or principle of music, to a condition which music alone completely realises; and one of the chief functions of aesthetic criticism, dealing with the products of art, new or old, is to estimate the degree in which each of those products approaches, in this sense, to musical law. By no school of painters have the necessary limitations of the art of painting been so unerringly though instinctively apprehended, and the essence of what is pictorial in a picture so justly conceived, as by the school of Venice; and the train of thought suggested in what has been now said is, perhaps, a not unfitting introduction to a few pages about Giorgione, who, though much has been taken by recent criticism from [140] what was reputed to be his work, yet, more entirely than any other painter, sums up, in what we know of himself and his art, the spirit of the Venetian school.