This idea of the use of a canon may be illustrated in many ways; for, like all notions which resume actual experiences, it will be found applicable in many spheres. Thus, on the subject of verse, the eternal quarrel between the poet and the pedant is, that for the first the rules of prosody and rhyme are only useful in so far as they make the licenses he takes appreciable at their just value; while for the pedant such licenses ever anew seem to imply ignorance of the rule or incapacity to follow it,--an absurd mistake, since the power to create and impress has little to do with the means employed; and if a man builds up for himself a barrier of foregone conclusions about the exact manner in which alone he will allow himself to be deeply impressed, it is very certain he will have few save painful impressions. Or take another illustration--an artist the other day told me that he had noticed that one could almost always trace a faintly ruled vertical line on the paper which the greatest of all modern draughtsmen used. Ingres, then, with all his freedom, vivacity, and accuracy of control over the point he employed to draw with, still found it useful to have a straight line ruled on his paper as a student does, and may often even have resorted to the plumb-line. It enabled his eye to test the subtlest deviations in the other lines with which he was creating the balance, swing or stability of a figure. Rules of art are, like this straight line, dead and powerless in themselves: they help both creator and lover to follow and appreciate the infinite freedom and subtlety of the living work. The same thing might be illustrated with regard to manners; a fine standard of social address and receptivity must be established before the varieties and subtleties of those whose genius creates beautiful relations can be appreciated at their full value in their full variety. This dead law must be buried in everybody's mind and heart before they can rise to that conscious freedom which is opposite to the freedom of the wild animals, who never know why they do, nor appreciate how it is done; neither are they able to rejoice in the address of others; much less can they relish the infinite refinements of exhilarating apprehension, which make of laughter, tears, speech, silence, nearness and distance, a music which holds the enraptured soul in ecstasy; which created and constantly renews the hope of Heaven. And what blacker minister of a more sterile hell than the social pedant who only knows the rule, and mistakes grace and delicacy, frankness and generosity, for more or less grave infractions of it? But the happy critic, free from any personal knowledge of what creation means, or what aids are likely to forward it, is for ever in such a hurry to correct great creators like Leonardo, Dürer, or Hokusai, that he fails to understand them; and when he has caught them saying, "This is how anger or despair is expressed," calmly smiles in his superiority and says,