The extent of the abuse now in question will be seen, if I call the attention of the Senate to the last Report of the Committee of Investigation. By that Report it appears that they undertook to examine two agents of the Telegraph Company, who, finally, at the last moment, when asked to make a definitive statement with regard to the copy of the Treaty lodged with them for communication to New York, declined to answer. And you have now in this usurpation of the Senate an attempt to break into the telegraph-offices of the United States. You raise, for the first time in this Chamber, one of the great questions of the times. Can you do any such thing? MR. NYE [of Nevada]. I should like to ask the Senator from Massachusetts if the courts have not broken into the telegraph-offices? MR. SUMNER. I am not speaking about the courts. I am speaking about the Senate of the United States. MR. NYE. I ask the Senator if the Senate of the United States, in this investigation, as long as it exists, has not all the authority of a court? MR. SUMNER. I have already stated that it has not,--that it has not the authority of a justice of the peace. The Senate proposes to break into the telegraph-offices of the United States. In the guise of privilege, it enters those penetralia and insists that the secrets shall be disclosed. What is the difference between a communication by telegraph and a communication by letter? Is there not a growing substitution of the telegram for the letter? Has not this taken place to an immense extent in England? Is it not now taking place to an immense extent in our own country? Now, Sir, mark the limitation of my language. I do not mean to say that the telegram is entitled to all the sacredness of the letter; but I do insist that the Senate, before it undertakes to break into the telegraph-offices of the United States, shall calmly consider the question, and see to what end the present disposition will carry them. Senators who have not entirely forgotten the recent history of England know that the powerful Cabinet of Sir Robert Peel for a time trembled under the imputation that one of its ablest members, Sir James Graham, who, Mr. Webster told me, in his judgment, was the best speaker in Parliament, had authorized the opening of the letters of Mazzini at the Post-Office. The subject was brought before Parliament night after night. You shall see how it was treated. The Liberal member from Finsbury, Mr. Duncombe, in presenting it first,--I read from Hansard,--after inveighing against the opening of letters, said:--