To this end Whistler’s many and long sittings were of inestimable service. The portrait grew with his acquaintance with his sitter. What first pleased him as a scheme of color and an agreeable personality came in time to interest him as a human being, with the result in the most successful canvases that the picture would be all he desired as a harmony, as a song without sound, and also a marvellously subtle realization of his impression of the human being he had learned to know. * * * * * In one respect the identity of a portrait is not a matter of entire indifference, for the attitude of the painter is more or less affected by his relation to the sitter, and whatever affects him affects his work. Many an artist does his best when his wife or child or some one he loves is the model; and the man who could not paint his mother a little better, a little more sympathetically than a stranger would be soulless indeed. In poetry the influence of a mistress is a matter of tradition. The picture, as a work of art, must be judged independently of its associations. It stands by itself, and is good, bad, or indifferent, regardless of the painter or the conditions under which it was done; but some of its excellencies may be explained if we learn it was a labor of love. It would not add a feather’s weight to the superb qualities of the “Hermes,” at Olympia, if it were discovered to be a likeness of the sculptor’s son; nor would it detract in the slightest degree from its perfection if it were found to have been the work of an unknown man, and not by Praxiteles,--though in the latter case there would be a great abatement of enthusiasm on the part of the touring public. But if a number of the master’s works were in existence, and it was perceived that the “Hermes” possessed certain qualities of tenderness, certain indefinable elements of superiority that made it the masterpiece, the knowledge that some one whom the sculptor loved dearly had posed would help to explain the almost imperceptible differences. The work would stand on its own merits; but one of the reasons why it stood so high would be found in the relationship between sculptor and model. By many who should be qualified to speak Whistler’s portrait of his mother is considered his masterpiece, possibly by some because it is of his mother, but by others quite independently of the relationship. Others there are who consider the portrait of Carlyle his masterpiece, possibly because it is of Carlyle, but by some independently of the identity of the sitter. Seldom is the portrait of any unknown or less known sitter mentioned in comparison,--all of which goes to show the bias which results from knowing the identity. Every Scotchman would insist upon the Carlyle, most of them quite unconscious of the patriotic bias.