Upon the whole, it is evident, that the ancients studied these arts very differently from the moderns: Lomazzo seems to be partly aware of this, by what he says in the division of his work, page 9, "There is a two-folde proceeding in all artes and sciences: the one is called the order of nature, and the other of teaching. Nature proceedeth ordinarily, beginning with the unperfect, as the particulars, and ending with the perfect, as the universals. Now if in searching out the nature of things, our understanding shall proceede after that order, by which they are brought forth by nature, doubtlesse it will be the most absolute and ready method that can bee imagined. For we beginne to know things by their first and immediate principles, &c. and this is not only mine opinion but Aristotles also," yet, mistaking Aristotle's meaning, and absolutely deviating from his advice, he afterwards says, "all which if we could comprehend within our understanding, we should be most wise; but it is _impossible_," and after having given some dark reasons why he thinks so, he tells you "he resolves to follow the order of teaching," which all the writers on painting have in like manner since done. Had I observed the foregoing passage, before I undertook this essay, it probably would have put me to a stand, and deterred me from venturing upon what Lomazzo calls an impossible task: but observing in the foremention'd controversies that the torrent generally ran against me; and that several of my opponents had turn'd my arguments into ridicule, yet were daily availing themselves of their use, and venting them even to my face as their own; I began to wish the publication of something on this subject; and accordingly applied myself to several of my friends, whom I thought capable of taking up the pen for me, offering to furnish them with materials by word of mouth: but finding this method not practicable, from the difficulty of one man's expressing the ideas of another, especially on a subject which he was either unacquainted with, or was new in its kind, I was therefore reduced to an attempt of finding such words as would best answer my own ideas, being now too far engaged to drop the design. Hereupon, having digested the matter as well as I could, and thrown it into the form of a book, I submitted it to the judgment of such friends whose sincerity and abilities I could best rely on, determining on their approbation or dislike to publish or destroy it: but their favourable opinion of the manuscript being publicly known, it gave such a credit to the undertaking, as soon changed the countenances of those, who had a better opinion of my pencil, than my pen, and turn'd their sneers into expectation: especially when the same friends had kindly made me an offer of conducting the work through the press. And here I must acknowledge myself particularly indebted to one gentleman for his corrections and amendment of at least a third part of the wording.