As it is required that the subject selected should be a general one, it is no less necessary that it should be kept unembarrassed with whatever may any way serve to divide the attention of the spectator. Whenever a story is related, every man forms a picture in his mind of the action and expression of the persons employed. The power of representing this mental picture on canvas is what we call invention in a Painter. And as, in the conception of this ideal picture, the mind does not enter into the minute peculiarities of the dress, furniture, or scene of action; so, when the Painter comes to represent it, he contrives those little necessary concomitant circumstances in such a manner that they shall strike the spectator no more than they did himself in his first conception of the story. I am very ready to allow that some circumstances of minuteness and particularity frequently tend to give an air of truth to a piece, and to interest the spectator in an extraordinary manner. Such circumstances, therefore, cannot wholly be rejected: but if there be anything in the Art which require peculiar nicety of discernment, it is the disposition of these minute circumstantial parts; which, according to the judgment employed in the choice, become so useful to truth, or so injurious to grandeur. However, the usual and most dangerous error is on the side of minuteness; and, therefore, I think caution most necessary where most have failed. The general idea constitutes real excellence. All smaller things, however perfect in their way, are to be sacrificed without mercy to the greater. The Painter will not inquire what things may be admitted without much censure; he will not think it enough to show that they may be there; he will show that they must be there; that their absence would render his picture maimed and defective. Thus, though to the principal group a second or third be added, and a second and third mass of light, care must be taken that these subordinate actions and lights, neither each in particular, nor all together, come into any degree of competition with the principal: they should merely make a part of that whole which would be imperfect without them. To every kind of painting this rule may be applied. Even in portraits, the grace, and, we may add, the likeness consists more in taking the general air than in observing the exact similitude of every feature.