I apprehend a good deal of this will look more like resentment, and a design to invalidate the objections of such as are not likely to set the faults of this work in the most favourable light; than merely for the encouragement, as was said above, of such of my readers, as are neither painters, nor connoisseurs: and I will be ingenuous enough to confess something of this may be true; but, at the same time, I cannot allow that this alone would have been a sufficient motive to have made me risk giving offence to any; had not another consideration, besides that already alledg'd, of more consequence to the purpose in hand, made it necessary. I mean the setting forth, in the strongest colours, the alterations objects seemingly undergo through the prepossessions and prejudices contracted by the mind.----Fallacies, strongly to be guarded against by such as would learn to see objects truly! Altho' the instances already given are pretty flagrant, yet it is certainly true, (as a farther confirmation of this, and for the consolation of those, who may be a little piqued at what has been said) that painters of every condition are stronger instances of the almost unavoidable power of prejudice, than any people whatever. What are all the _manners_, as they are call'd, of even the greatest masters, which are known to differ so much from one another, and all of them from nature, but so many strong proofs of their inviolable attachment to falshood, converted into establish'd truth in their own eyes, by self-opinion? Rubens would, in all probability, have been as much disgusted at the dry manner of Poussin, as Poussin was at the extravagant of Rubens. The prejudices of inferior proficients in favour of the imperfections of their own performances, is still more amazing.----Their eyes are so quick in discerning the faults of others, at the same time they are so totally blind to their own! Indeed it would be well for us all, if one of Gulliver's flappers could be placed at our elbows to remind us at every stroke how much prejudice and self-opinion perverts our sight. From what has been said, I hope it appears that those, who have no bias of any kind, either from their own practice, or the lessons of others, are fittest to examine into the truth of the principles laid down in the following pages. But as every one may not have had an opportunity of being sufficiently acquainted with the instances, that have been given: I will offer one of a familiar kind, which may be a hint for their observing a thousand more. How gradually does the eye grow reconciled even to a disagreeable dress, as it becomes more and more the fashion, and how soon return to its dislike of it, when it is left off, and a new one has taken possession of the mind?--so vague is taste, when it has no solid principles for its foundation!