'My habits have been so much deranged by change of place, that I have not yet got rightly settled to my studies. I have read little since I saw you: and of that little, I doubt, I have not made the best use. Have you seen Playfairs introductory essay in the Encyclopedia? I am sure you will like it. It is distinguished for its elegance & perspicuity. I perused it some weeks ago, and thought it greatly preferable to Stewarts. Indeed I have often told you, that I am somewhat displeased with myself because I cannot admire this great philosopher, half as much as many critics do. He is so very stately - so transcendental - and withal so unintelligible, that I cannot look upon him with the needful veneration. I was reading the second volume of his "Philosophy of the human mind", lately. It is principally devoted to the consideration of Reason. The greater part of the book is taken up with statements of the opinions of others; and it often required all my penetration to discover what the Author's own views of the matter were. He talks much about Analysis & Mathematics, and disports him very pleasantly upon geometrical reasoning; but leaves what is to me the principal difficulty, untouched. Tell me if you have read it.'