Letters from Ravenna, in the Genoa Gazette, give appalling accounts of the progress of brigandage in the Roman states. Two persons, considered as spies by the bandits, had been decapitated by them in the vicinity of the above-mentioned town, and their heads placed on poles at a cross-road. The diligence of Imola has lately been stopped and robbed of 1000 scudi (5500f.) belonging to the Pope. At Lugo, three individuals carried off 11,000f. from a bank, and passed triumphantly through the town with their booty, without any one daring to stop them.

An extensive conspiracy has recently been discovered at Teheran. The most influential members of the clergy were at the head of it, and its object was to overthrow the present Shah, to replace him by a descendant of Ali, and to drive all the Turks out of Persia. Numerous arrests have been made at Teheran, and in the principal towns. The greater number of those arrested belong to the body of Ulemas.

LETTERS, SCIENCE, ART, PUBLIC MEN, Etc.

UNITED STATES.

The past month has not been marked by any movements of importance in any of these departments. Our publishers have generally confined their issues to works especially intended for the holiday season. Most of our public men have been recruiting themselves from the fatigues of the late protracted session of Congress, or preparing, by taking part in the political canvass, for the session that is at hand. Mr. Clay was received at Lexington with abundant demonstrations of enthusiastic personal and political affection. He has remained at home during the vacation.

Mr. Webster has been spending some weeks at his farm in Marshfield, and at his native town, Franklin, N.H. During his stay at the latter place a number of his old friends and neighbors paid him a visit, and sat down to an old-fashioned dinner, at which friendly greetings were exchanged with their distinguished host. The occasion was one of rare enjoyment. Mr. Webster's health has been very sensibly benefited by this greatly needed interval of relaxation from public duties. In some remarks made at an informal meeting with some friends in Boston, Mr. W. said that for six months during the last session of Congress, he had not slept two hours any one night.

A public dinner was recently given at Boston to Amin Bey, the Turkish Envoy to the United States, by some of the merchants of Boston. Thomas B. Curtis presided, and a large number of distinguished guests were present. Amin Bey replied to a toast complimentary to the Sultan, by expressing his warm sense of the friendliness with which he had been received in this country, and his earnest desire for an extension of commerce and of mutual kind offices between his own government and that of the United States. Mr. Webster made a brief and eloquent response to a toast thanking him for his efforts in behalf of the Union. In the course of his remarks he said that "the slavery question New England could only interfere with as a meddler: she had no more to do with it than she had with the municipal government of a city in the Island of Cuba." Very eloquent speeches, breathing similar sentiments, were made by Edward Everett, Mr. Winthrop, and others and J.P. Brown Esq., the interpreter of Amin Bey, responded happily to a toast complimenting Hon. George P. Marsh the American Minister at Constantinople. Mr. Brown said that as a diplomatist and a scholar Mr. Marsh enjoyed, in an eminent degree, the respect and esteem of the enlightened young Sultan of Turkey, and all his Ministers.

M. Alexandre Vattemare, who is known as the founder of the system of International Exchanges, has taken leave of the United States in a very warm and eloquent address, expressing his gratitude for the kindness of his reception, his brilliant anticipations of the great results which time will develop from the system to which he has devoted his life, and commending it to the favor and aid of the American people. The world has seen few instances of rarer or more disinterested devotion to high public objects than this amiable and enthusiastic gentleman has exhibited.

The statue of John C. Calhoun, made by Powers for the City of Charleston, and which was lost by shipwreck off Fire Island, has been recovered, and sent forward to its destination. The left arm was broken off at the elbow: with this exception it was uninjured.

At a recent meeting of the Academy of Design in New York, it was stated by the president, Mr. Durand, that the institution had incurred a considerable debt beyond its resources, and mentioned a proposition that the artists connected with it should paint pictures to be disposed of for the benefit of the Academy. In regard to the mode of disposing of them a raffle was suggested: but Mr. Cozzens, the President of the Art-Union, being present as an honorary member, at once offered to purchase them at such a price as might be fixed upon them by the Academy. The proposition was at once accepted, and has given great and general satisfaction as an indication of good feeling between two institutions which have been sometimes represented as hostile to each other.