We shall consider first that division of the subject which stands first in order,--the Invention which consists in the new combination of known forms. This may be said to be governed by its exclusive relation either to _what is_, or _has been_, or, when limited by the _probable_, to what strictly may be. It may therefore be distinguished by the term Natural. But though we so name it, inasmuch as all its forms have their prototypes in the Actual, it must still be remembered that these existing forms do substantially constitute no more than mere _parts_ to be combined into a _whole_, for which Nature has provided no original. For examples in this, the most comprehensive class, we need not refer to any particular school; they are to be found in all and in every gallery: from the histories of Raffaelle, the landscapes of Claude and Poussin and others, to the familiar scenes of Jan Steen, Ostade, and Brower. In each of these an adherence to the actual, if not strictly observed, is at least supposed in all its parts; not so in the whole, as that relates to the probable; by which we mean such a result as _would be_ true, were the same combination to occur in nature. Nor must we be understood to mean, by adherence to the actual, that one part is to be taken for an exact portrait; we mean only such an imitation as precludes an intentional deviation from already existing and known forms. It must be very obvious, that, in classing together any of the productions of the artists above named, it cannot be intended to reduce them to a level; such an attempt (did our argument require it) must instantly revolt the common sense and feeling of every one at all acquainted with Art. And therefore, perhaps, it may be thought that their striking difference, both in kind and degree, might justly call for some further division. But admitting, as all must, a wide, nay, almost impassable, interval between the familiar subjects of the lower Dutch and Flemish painters, and the higher intellectual works of the great Italian masters, we see no reason why they may not be left to draw their own line of demarcation as to their respective provinces, even as is every day done by actual objects; which are all equally natural, though widely differenced as well in kind as in quality. It is no degradation to the greatest genius to say of him and of the most unlettered boor, that they are both men. Besides, as a more minute division would be wholly irrelevant to the present purpose, we shall defer the examination of their individual differences to another occasion. In order, however, more distinctly to exhibit their common ground of Invention, we will briefly examine a picture by Ostade, and then compare it with one by Raffaelle, than whom no two artists could well be imagined having less in common.