From those communications, and such other investigations as the pressure of business has enabled me to make, I am satisfied that the establishment of a system of telegraphs for the United States would be useful to commerce as well as the Government. It might most properly be made appurtenant to the Post Office Department, and, during war, would prove a most essential aid to the military operations of the country. The expense, attending it is estimated carefully in some of the documents annexed; but it will depend much upon the kind of system adopted: upon the extent and location of the lines first established; and the charges made to individuals for communicating information through it which may not be of a public character. On these points, as the Department has not been requested to make a report, no opinion is expressed; but information concerning them was deemed useful as a guide in deciding on the propriety of establishing telegraphs, and was, therefore, requested in the circular before mentioned. Many useful suggestions in relation to the subject will be found in the correspondence annexed, and in the books there referred to. The Department would take this occasion to express, in respect to the numerous gentlemen whose views are now submitted to Congress, its high appreciation and sincere acknowledgments for the valuable contributions they have made on a subject of so much interest. I remain, very respectfully, Your obedient servant, LEVI WOODBURY, _Secretary of the Treasury_. The Hon. J. K. POLK, _Speaker of the House of Representatives_. No. 1. _Circular to certain Collectors of the Customs, Commanders of Revenue Cutters, and other persons._ TREASURY DEPARTMENT, _March 10, 1837_.