About twelve o'clock I started from Wanstead in my tandem, and, as I was driving down Cheapside at a pretty smart pace, I met a considerable crowd going towards the Mansion-House; and, just after I passed Bow- Church, I saw Mr. John Castles amongst those who appeared to be going in a contrary direction from that which led to Spafields. He beckoned me, and I drew up to the pavement to inquire the cause of what appeared to me rather extraordinary. Before, however, I could put the question to Mr. Castles, he inquired where I was going? to which I replied, "to Spafields, to be sure." "Oh," said he, "the meeting has been broken up these two hours nearly; young Watson has got possession of the Tower, and we are all going thither; turn your horses' heads and come with us." I gave him a look that appeared to strike him dumb, and laying my whip upon my wheel-horse, I passed rapidly on, exclaiming "what a ------ scoundrel!" I looked at the clock of Bow-Church, and saw that it wanted a quarter of an hour to one. I drove on at a smart pace towards Spafields, and observed to my servant, that I had no doubt in my own mind that Castles, the villain whom we had met, was an agent of the Government, a spy; and the suspicions which I entertained of him when I first met him, were now fully confirmed. When we reached Spafields, the throng was very great, much larger than even at the first meeting of the 15th of November. By the kindness of the multitude I was enabled to drive up to the door of the Merlin's Cave, in the front of which the people were assembled. My servant returned with my tandem, with orders to have my horse Bob, which I drove as leader, ready in the evening with a saddle and bridle on, that I might ride him home to my Inn from the meeting. The cheers of the congregated tens of thousands were almost insupportable; I never heard such before. I made my way into the Merlin's Cave with difficulty, as it was again taken possession of by the police. When I entered the room, I found very few persons there except the newspaper reporters, and the police magistrates with their officers, and none of those that had taken any part at the previous meeting but Mr. William Clark, who was again appointed to take the chair. Watson, Thistlewood, Preston, and all that party were absent, but I had no knowledge of the cause, any farther than the intimation which I had received from the very worthy Mr. John Castles, not one word of which did I believe to be true.