That Panizzi, in after years, disagreed “_in toto_” with his friend’s principles is notorious; but the actual origin of their estrangement will for ever remain a mystery. In November, 1844, an article appeared in the “_North British Review_,” written by Panizzi, and entitled “_Post-Office Espionage_.” The opening of Mazzini’s letters at the Post-Office, and their perusal by the authorities, formed the subject of this treatise, and those revelations immediately aroused John Bull to a pitch of honest indignation—“highly creditable to the moral feeling and sound, good sense of the nation.” We learn from this article that Mazzini’s suspicions were first awakened by observing that his letters were doubly stamped; the stamp of 2 o’clock in the afternoon, for instance, superseding that of 12 at noon. Having read in an Austrian paper that the English authorities had undertaken to watch the proceedings of the Italian refugees in Great Britain, the idea struck Mazzini that it was not improbable that recourse might be had to opening his letters. This was communicated to Panizzi, who strongly dissuaded Mazzini from giving credence to such strange suspicions regarding the English Government. He spurned this well-meant counsel, posted letters directed to himself and to others, in the presence of witnesses, and found that whilst the other letters were regularly delivered, his own were as frequently delayed; he sealed them with wax, placing the impression in a particular position, and then discovered that that position of the seal had been changed. Another artifice was resorted to. Grains of sand were enclosed in letters: they reached other parties safely, but had disappeared from the letters directed to himself. This, on the 14th of June, 1844, induced Mr. T. S. Duncombe, Member for Finsbury, to present a petition from four gentlemen, living at No. 47, Devonshire Street, Queen Square, alleging that their letters had been delayed and opened by the authorities at the Post-Office. Sir James Graham, the Home Secretary, did not deny that he had issued his warrant for the adoption of such a course, adding, moreover, that a power was given by Statute to the Secretary of State to open letters in transit through the Post-Office. This led to some members of the Liberal side taking up the subject with much warmth, and denouncing such proceedings as despotic and perfectly unconstitutional. Their own action was not altogether left undefended by the Ministers. Mr. Duncombe, though unsuccessful, showed no disposition to let the matter rest here, and ultimately succeeded in the formation of a Committee of both Houses, composed of some of the most eminent amongst their respective members. A report was printed, showing that the warrants of the Secretary of State in previous cases were issued only on peculiar emergencies. There was no other result from this affair, except that a Bill was introduced by Lord Radnor in the Upper House for the abolition of the power complained of;