Our Common has been ample enough for the past; but the metropolis has already outgrown it in every respect. Besides being too narrow in proportions, it is wanting in those accessories of beauty and of knowledge especially illustrative of Natural History, which, according to the experience of other countries, are proper for public grounds. I wish much to see there, among other things, an arboretum, where every tree that can bear our climate shall find its classified place,--pleasing the eye by its beauty, protecting the body by its shade, and speaking to all by the voice of Science. Accept the thanks of an absent citizen, who never thinks of his native Boston without a yearning to see it foremost in all that contributes to a true civilization; and believe me to be, my dear Sir, Very faithfully yours, CHARLES SUMNER. To GEORGE H. SNELLING, Esq. ATTEMPT TO KIDNAP A CITIZEN UNDER ORDER OF THE SENATE. THE CASE OF FRANK B. SANBORN, OF CONCORD, MASSACHUSETTS, WITH SPEECHES IN THE SENATE, APRIL 10, 13, AND 16, 1860. The case of Mr. Sanborn illustrates the reach of the Slave Power, and the extent to which the Senate did its bidding, at the instance of the author of the Fugitive Slave Bill. It is one of the skirmishes in the warfare with Slavery. April 10, 1860, Mr. Sumner presented the memorial of Mr. Sanborn, which he explained as follows. I have a memorial, Mr. President, from Frank B. Sanborn, of Concord, Massachusetts, setting forth a gross attempt to kidnap, by men pretending to act in the name of the Senate of the United States. The memorial is authenticated by his affidavit before a notary public. It sets forth, that, on the evening of the 3d of April, certain persons, who had been prowling about his neighborhood, under shelter of night, with fraudulent pretence drew him to his door, seized him, handcuffed him, and then by force undertook to convey him to a carriage. By the courageous interposition of a refined lady, his sister, neighbors were aroused; the village was next summoned by the ringing of bells, and at length that great friend of the oppressed in our country, the writ of _Habeas Corpus_, arrived on the ground. By intervention of that writ he was taken from the custody of the kidnappers. The next day a hearing was had before the Supreme Court of Massachusetts; and Chief Justice Shaw, for thirty years the honored Chief Justice of Massachusetts, whose opinions are respected in every part of the country, representing the full bench, without undertaking to pass upon the question of jurisdiction in the Senate, went on to declare that the power delegated to its Sergeant-at-Arms could not be delegated to another, and that therefore all these proceedings were void, and the prisoner was discharged.