The intelligence from Germany is neither interesting nor important. The Sovereigns of Austria and Prussia seem to be acting together for the entire suppression of every thing like constitutional rights and liberty in the German states. A proposition is about to be laid before the Diet by these two powers, declaring that "the so-called fundamental rights of the German people," proclaimed in the Constitutions of 1848 and 1849, are neither valid as a law of the Empire, nor binding on the several states, and they be therefore repealed, with all laws based upon them.--In the Italian dominions of Austria, the state of things is gloomy and ominous. Arrests of compromised persons are continually made in Milan and Verona. In the latter city, one of the new prisoners was a lady of rank, accused of forwarding a correspondence to Mazzini. A system of espionage has been adopted in the Venetian provinces of Austria, unparalleled for its inquisitorial and oppressive character, in the history of the most despotic states. Many persons belonging to the higher classes have been arrested in Verona, and nearly every night domiciliary visits are made by the police. The public mind throughout Austrian Italy is described as in a state of the most violent excitement, and insurrection is apprehended by government. Marshal Radetzky published a proclamation to the Lombardo-Venetian kingdom on the 9th of July, and from his head-quarters at Monga. The Lombardo-Venetian kingdom is declared to be in a state of siege; the communes are made responsible for all assassinations similar to that of Vandoni at Milan; and the inhabitants will be severely dealt with if they do not immediately surrender all such offenders to the military. Two musical artists have been made victims to the paltry prosecution of the Austrian government. Mdlle. Anna Zerr, for having visited two of the Hungarian exiles resident in London, and for having consented to sing at a concert for the relief of the Hungarian refugees, has, on her return to Vienna, been deprived of her place of Imperial Chamber-singer, prohibited from appearing on the stage of the Imperial Theatre, where she was one of the most distinguished performers, and placed under the surveillance of the police. And Leopold Iansa, an eminent violinist, who has been for many years in the Imperial Chapel, was dismissed for a similar offense. The Austrian authorities recently opened packages addressed to the United States consulate at Venice. Mr. Flagg, the American consul, remonstrated, and was told in reply, that the government claimed the right to examine all publications introduced into the Venetian States, no matter from what quarter or to what address. Several communications have passed upon the subject.