Imitation interests, then, by exciting a more intense perception of truth, and calling out the powers of observation and comparison: wherever this effect takes place the interest follows of course, with or without the imitation, whether the object is real or artificial. The gardener delights in the streaks of a tulip, or ‘pansy freak’d with jet’; the mineralogist in the varieties of certain strata, because he understands them. Knowledge is pleasure as well as power. A work of art has in this respect no advantage over a work of nature, except inasmuch as it furnishes an additional stimulus to curiosity. Again, natural objects please in proportion as they are uncommon, by fixing the attention more steadily on their beauties or differences. The same principle of the effect of novelty in exciting the attention, may account, perhaps, for the extraordinary discoveries and lies told by travellers, who, opening their eyes for the first time in foreign parts, are startled at every object they meet. Why the excitement of intellectual activity pleases, is not here the question; but that it does so, is a general and acknowledged law of the human mind. We grow attached to the mathematics only from finding out their truth; and their utility chiefly consists (at present) in the contemplative pleasure they afford to the student. Lines, points, angles, squares, and circles are not interesting in themselves; they become so by the power of mind exerted in comprehending their properties and relations. People dispute for ever about Hogarth. The question has not in one respect been fairly stated. The merit of his pictures does not so much depend on the nature of the subject, as on the knowledge displayed of it, on the number of ideas they excite, on the fund of thought and observation contained in them. They are to be looked on as works of science; they gratify our love of truth; they fill up the void of the mind: they are a series of plates of natural history, and also of that most interesting part of natural history, the history of man. The superiority of high art over the common or mechanical consists in combining truth of imitation with beauty and grandeur of subject. The historical painter is superior to the flower-painter, because he combines or ought to combine human interests and passions with the same power of imitating external nature; or, indeed, with greater, for the greatest difficulty of imitation is the power of imitating expression. The difficulty of copying increases with our knowledge of the object; and that again with the interest we take in it. The same argument might be applied to shew that the poet and painter of imagination are superior to the mere philosopher or man of science, because they exercise the powers of reason and intellect combined with nature and passion. They treat of the highest categories of the human soul, pleasure and pain.