Professor Gale, of our university, and Mr. Alfred Vail, of the Speedwell iron-works, near Morristown, New Jersey, are now associated with me in the scientific and mechanical parts of the invention. We have procured several miles of wire, and I am happy to announce to you that our success has thus far, been complete. At a distance of _five miles_, with a common Cruikshank’s battery of 87 plates, (4 by 3½ inches each plate,) the marking was as perfect on the register as in the first instance of half a mile. We have recently added _five miles more_, making in all _ten miles_, with the _same result_; and we have now no doubt of its effecting a _similar result_ at _any distance_. I also stated to you, sir, that machinery was in progress of making, with which, so soon as it should be completed, I intended to proceed to Washington, to exhibit the powers of the invention before you and other members of the Government. I had hoped to be in Washington before the session of Congress, but I find that the execution of new machinery is so uncertain in its time of completion, that I shall be delayed, probably, until the beginning of the year. What I wish to learn from you, sir, is, “_How late in the session can I delay my visit, and yet be in season to meet the subject of telegraphs, when it shall be presented by your report to Congress?_” I am anxious, of course, to show as perfect an instrument as possible, and would wish as much time for the purpose of perfecting it as can be allowed without detriment to my interests as an applicant for the attention of Government to the best plan of a telegraph. I am, my dear sir, with the greatest respect and personal esteem, Your most obedient servant, SAML. F. B. MORSE. HON. LEVI WOODBURY, _Secretary of the Treasury_. No. 4. [From the New York Journal of Commerce.] We have received the following note and diagram, with the explanation of the latter, from Mr. Morse: _To the Editors of the Journal of Commerce:_ GENTLEMEN: You had the kindness to assert, a few days ago, my claim to the invention of the _electro magnetic telegraph_, for which I thank you. As to the priority of my invention, entirely planned and for the most part executed as it was nearly five years ago, I can adduce the amplest proof.