I am truly sensible how unequal I have been to the expression of my own ideas. To develop the latent excellencies, and draw out the interior principles of our art requires more skill and practice in writing than is likely to be possessed by a man perpetually occupied in the use of the pencil and the pallet. It is for that reason, perhaps, that the sister Art has had the advantage of better criticism. Poets are naturally writers of prose. They may be said to be practising only an inferior department of their own art, when they are explaining and expatiating upon its most refined principles. But still such difficulties ought not to deter Artists, who are not prevented by other engagements, from putting their thoughts in order as well as they can, and from giving to the public the result of their experience. The knowledge which an Artist has of his subject will more than compensate for any want of elegance in the manner of treating it, or even of perspicuity, which is still more essential; and I am convinced that one short essay written by a Painter will contribute more to advance the theory of our art than a thousand volumes such as we sometimes see; the purpose of which appears to be rather to display the refinement of the Author's own conceptions of impossible practice, than to convey useful knowledge or instruction of any kind whatever. An Artist knows what is, and what is not, within the province of his art to perform; and is not likely to be for ever teasing the poor Student with the beauties of mixed passions, or to perplex him with an imaginary union of excellencies incompatible with each other. To this work, however, I could not be said to come totally unprovided with materials. I had seen much, and I had thought much upon what I had seen; I had something of an habit of investigation, and a disposition to reduce all that I observed and felt in my own mind to method and system; but never having seen what I myself knew distinctly placed before me on paper, I knew nothing correctly. To put those ideas into something like order was, to my inexperience, no easy task. The composition, the _ponere totum_ even of a single Discourse, as well as of a single statue, was the most difficult part, as perhaps it is of every other art, and most requires the hand of a master. For the manner, whatever deficiency there was, I might reasonably expect indulgence; but I thought it indispensably necessary well to consider the opinions which were to be given out from this place, and under the sanction of a Royal Academy; I therefore examined not only my own opinions, but likewise the opinions of others. I found in the course of this research many precepts and rules established in our art, which did not seem to me altogether reconcilable with each other, yet each seemed in itself to have the same claim of being supported by truth and nature; and this claim, irreconcilable as they may be thought, they do in reality alike possess.