The discovery of this diabolical system took place in the course of the trial of three men named Quin, Riorton, and Connolly; it appears that these unfortunate beings were detected in fabricating base shillings and bank tokens, and being brought to trial, they were convicted. During the examination of the witnesses for the prosecution, however, whose names appear at the head of this article, some circumstances came out, which induced a suspicion in the mind of the lord mayor that the prosecutors were in some way mixed up with the guilt of the prisoners. An investigation in consequence took place; but the convicts, on being confronted with their accusers, refused to say anything against them, saying that they were "under an oath." They were Irishmen and Catholics, and the rigid observance which they pay to an oath is well known; but a priest having at length persuaded them that they were not bound by such an oath administered unlawfully, they disclosed the whole particulars of the plot, and their accusers were in consequence secured. The three new prisoners were then indicted for their participation in the crime of their dupes, which amounted to high treason; and at the session held on the 25th of September 1816, were brought to trial at the Old Bailey. A man named Barry then swore that Pelham had applied to him to get some men to make bad shillings, which Power, it was said, could colour. Barry said they must go to the market for them, which was in Cheapside, at the corner of King-street, where poor Irishmen were waiting for employment. Some days after he went with Brock and Power to the market, when Quin and Riorton were engaged by them. Being told they could not be employed unless they would be sworn to secrecy, they took an oath on a piece of paper. A room was hired, and tools procured by the prisoners, and the poor Irishmen were set to work to cut brass into the form of shillings, &c. under the superintendence of Power. Connolly was sent for to assist. He said to Barry, in Irish, "We are doing a job that will hang us all," to which he replied that if he thought so he would not work another day at it. The Irishmen were then employed in colouring the metal, and everything being in readiness, notice was given, the officers entered, and the Irishmen were seized, tried, and found guilty. Pelham's landlady proved that the scissars used by the Irishmen in cutting through brass had been procured by her at Pelham's request; another woman also swore that the hammer and files taken in the coining room had been sold by her to Brock and Pelham. Brock, in his defence, declared his innocence. Power denied either going to the market or the room; and Pelham said the Barrys were noted perjurers, and the women were false witnesses. The jury, without hesitation, however, brought in a verdict of Guilty, and the prisoners were transported.