In a letter from Mr. E. I. Dupont of August 11, 1817, I received the favor of your "_Esquisse d'un ouvrage sur l'education comparée,_" which he said had been received by his father a few days before his death; and on the 9th of September, 1817, I answered his letter, in which was the following paragraph: "I duly received the pamphlet of M. Jullien on Education, to whom I had been indebted some years before for a valuable work on the same subject. Of this I expressed to him my high estimation in a letter of thanks, which I trust he received. The present pamphlet is an additional proof of his useful assiduities on this interesting subject, which, if the condition of man is to be progressively ameliorated, as we fondly hope and believe, is to be the chief instrument in effecting it." I hoped that Mr. E. I. Dupont, in acknowledging to you the receipt of your letter to his father, would be the channel of conveying to you my thanks, as he was to me of the work for which they were rendered. Be assured, Sir, that not another scrip, either written or printed, ever came to me from you; and that I was incapable of omitting the acknowledgments they called for, and of the neglect which you have had so much reason to impute to me. I know well the uncertainty of transmissions across the Atlantic, but never before experienced such a train of them as has taken place in your favors and my acknowledgments of them. You will perceive that the letter I am now answering was eleven months on its passage to me.