At some time subsequent to the 6th of April he wrote to Mr. Paulding, saying that in a previous letter "I requested you to make an inquiry concerning a small pamphlet of Charles Pinckney printed at the close of the Federal Convention of 1787;" and on the 6th of June he again wrote to Mr. Paulding,
"June 6th, 1831.
"Dear Sir.—Since my letter answering yours of April 6th, in which I requested you to make an inquiry concerning a small pamphlet of Charles Pinckney printed at the close of the Federal Convention of 1787, it has occurred to me that the pamphlet might not have been put in circulation, but only presented to his friends, etc. In that way I may have become possessed of the copy to which I referred as in a damaged state. On this supposition the only chance of success must be among the books, etc., of individuals on the list of Mr. Pinckney's political associates and friends. Of those who belonged to N. York, I recollect no one so likely to have received a copy as Rufus King. If that was the case, it may remain with his representative, and I would suggest an informal resort to that quarter, with a hope that you will pardon this further tax on your kindness."
On the 27th of June he wrote to Mr. Paulding for the third time regarding the Observations:
"June 27th, 1831.
"Dear Sir:—With your favor of the 20th instant I received the volume of pamphlets containing that of Mr. Charles Pinckney, for which I am indebted to your obliging researches. The volume shall be duly returned, and in the mean time duly taken care of. I have not sufficiently examined the pamphlet in question, but I have no doubt that it throws light on the subject to which it has relation."
On the 25th of November he wrote at length to Jared Sparks setting forth all his objections to the draught and added: "Further discrepancies might be found in the observations of Mr. Pinckney, printed in a pamphlet by Francis Childs, in New York, shortly after the close of the Convention. I have a copy too mutilated for use, but it may probably be preserved in some of your historical repositories."
On the 5th of June 1835 he wrote to Judge Duer: "Other discrepancies will be found in a source also within your reach, in a pamphlet published by Mr. Pinckney soon after the close of the Convention, in which he refers to parts of his plan which are at variance with the document in the printed Journal. A friend who has examined and compared the two documents has pointed out the discrepancies noted below."
Then follows the list of discrepancies "pointed out" by "a friend"; and in this letter he refers Judge Duer to the library of the Historical Society of New York as the place where a copy of the Observations can be found.