Radetzky has issued a proclamation, under date of Feb. 21, from Verona, directed against revolutionary proclamations and pamphlets, threatening death against all who are engaged in circulating them. Every one into whose hands such a pamphlet may fall is directed to deliver it to the nearest person in office, though but a gendarme, and at the same time to declare how it came into his possession; the punishment for failure to do this is imprisonment in irons for a period of from one to five years. Washington's Birthday was celebrated at Rome with great enthusiasm. At a public dinner, Mr. Cass, our Chargé, presided and made a speech. Two odes, by Mrs. Stephens, were sung. Among the guests were Archbishop Hughes, and Mr. Hastings, the American Protestant Chaplain. The report that the American Protestant chapel at Rome had been closed is authoritatively contradicted by Mr. Hastings, who speaks in terms of high praise of the liberality which has been manifested toward him by the papal authorities. LITERATURE, SCIENCE, ART, PERSONAL MOVEMENTS, ETC. UNITED STATES. The Exhibition of the National Academy of Design is now open. It is universally admitted that the paintings surpass those of any previous year The opening of the Exhibition was celebrated, according to custom, by a dinner, attended by artists, amateurs, and men of letters. Admirable speeches were made by Rev. Doctors BELLOWS and BETHUNE, who, though pole-wide apart in the sphere of theology, spanning the distance between Arius and Calvin, find common grounds of sympathy in their love for, and appreciation of Art. Mr. DURAND, the President, in a very felicitous speech, narrated his experience as an artist and as one of the founders of the Academy. Mr. GREENOUGH, at Florence, has nearly completed his group of the _Pioneer_, for the Capitol at Washington. It represents a backwoodsman rescuing his wife and child from an Indian who is in the act of smothering them in the folds of his blanket. The action of the group symbolizes the one unvarying story of the contest between civilized and uncivilized man. The pioneer, standing almost erect, in the pride of conscious superiority, has dashed upon one knee the Indian, whose relaxed form, and cowering face upturned despairingly, express premonitions of the inevitable doom awaiting him, against which all his efforts would be unavailing. The heavy brow, compressed lip, and firm chin of the white man announce him one of a race born to conquer and rule, not so much by mere physical strength as by undaunted courage and indomitable will. Those who have seen the group pronounce it to be a sublime conception grandly executed.