All the morning occupied with a letter on the Salt question. At half-past two rode to the Cabinet robin. The Cabinet was to meet at three. We did not, however, all assemble till four, the Duke having been with Peel at the Home Office. Before the Duke came we had all been talking of the Lord Mayor's Day, and the manner in which we should go into the City and return, and the precautions taken against riot. The Duke and Peel came together, and it was evident from the first words the Duke spoke that he and Peel had made up their minds to put off the King's visit to the City. The Chancellor seemed almost to take fire at the idea of this, but the Duke very quietly begged him to hear the letters before he decided. The Duke then read various letters he had received, all warning him against going, as there was a plot to assassinate him, and raise a tumult. One of them was from Pearson, a Radical attorney. There was one from a coachmaker, saying he was satisfied, from what his men told him, there was such a design, and offering to come with eighteen of his people and guard the Duke. There was another offer, in a letter not read, to the same effect. There was an examination of a man who serves a Radical printer, and who formerly lived with Cobbett, which showed the intention to exist of attacking the Duke. The impression seemed to be general that the attempt would be made. There was a letter from the Lord Mayor elect (Alderman Key) to the Duke, telling him there was an intention amongst disaffected persons to excite tumult and confusion, and to attack him; that he could not be in safety without a guard, and a strong one; and that if an attack was made _in one quarter_ the civil force would not be sufficient. The Duke said he would not go. Peel, who had received many letters informing him of the intention to assassinate him, said if he went he would go privately, and come away privately. He observed that if our force, the disposition of which was mentioned, and was admirable, succeeded in putting down a riot along the line of the procession, he could not answer for the security of life or property in other parts of the town. We had information that the Duke's house would be attacked while he was in the City, and it was to be feared that fires might take place to exercise terror and create a diversion. The feeling in the Duke's mind was that we should not be justified in giving an occasion for the shedding of blood, by means of a crowd of our own making. The consequences of the collision would be incalculable, and might affect all parts of England. The consequences of putting off the King's visit were not lost sight of; the effect it would produce on the Funds, and on public confidence--all that would be said against the Government as weighing down the King by its unpopularity. The letter it was proposed to send was written, and the Duke and Peel went with it to the King at a little before seven.