But the French were equalled and indeed surpassed by the English in their amateur Aesthetics. The painter Hogarth was one day reading in Italian a speech about the beauty of certain figures, attributed to Michael Angelo. This led him to imagine that the figurative arts depend upon a principle which consists of conforming to a given line. In 1745 he produced a serpentine line as frontispiece of his collection of engravings, which he described as "the line of beauty." Thus he succeeded in exciting universal curiosity, which he proceeded to satisfy with his "Analysis of Beauty." Here he begins by rightly combating the error of judging paintings by their subject and by the degree of their imitation, instead of by their form, which is the essential in art. He gives his definition of form, and afterwards proceeds to describe the waving lines which are beautiful and those which are not, and maintains that among them all there is but one that is really worthy to be called "the line of beauty," and one definite serpentine line "the line of grace." The pig, the bear, the spider, and the frog are ugly, because they do not possess serpentine lines. E. Burke, with a like assurance in his examples, was equally devoid of certainty in his general principles. He declares that the natural properties of an object cause pleasure or pain to the imagination, but that the latter also procures pleasure from their resemblance to the original. He does not speak further of the second of these, but gives a long list of the natural properties of the sensible, beautiful object. Having concluded his list, he remarks that these are in his opinion the qualities upon which beauty depends and which are the least liable to caprice and confusion. But "comparative smallness, delicate structure, colouring vivid but not too much so," are all mere empirical observations of no more value than those of Hogarth, with whom Burke must be classed as an aesthetician. Their works are spoken of as "classics." Classics indeed they are, but of the sort that arrive at no conclusion. Henry Home (Lord Kaimes) is on a level a trifle above the two just mentioned. He seeks "the true principles of the beaux-arts," in order to transform criticism into "a rational science." He selects facts and experience for this purpose, but in his definition of beauty, which he divides into two parts, relative and intrinsic, he is unable to explain the latter, save by a final cause, which he finds in the Almighty. Such theories as the three above mentioned defy classification, because they are not composed by any scientific method. Their authors pass from physiological sensualism to moralism, from imitation of nature to finalism, and to transcendental mysticism, without consciousness of the incongruity of their theses, at variance each with itself.