Disappointed in this quarter, the odious race of incendiary spies of Government tried their arts, and succeeded in duping some individuals in Yorkshire, and many more in Derbyshire. That the principal Government spy, Oliver, was busily engaged in this work of stirring up the ignorant and suffering population to open insurrection from the 17th of April to the 7th of June, when such an outbreak took place in Derbyshire, we have the most complete evidence. It then came out, from a servant of Sir John Byng, commander of the forces in that district, that Oliver had previously been in communication with Sir John, and no doubt obtained his immediate liberation from him on the safe netting of his nine victims. In fact, in a letter from this Sir John Byng (then Lord Strafford), in 1846, to the Dean of Norwich, he candidly admits that he had received orders from Lord Sidmouth to assist the operations of Oliver, who was, his lordship said, going down into that part of the country where meetings were being frequently held, and that Oliver, who carried a letter to Sir John, was to give him all the information that he could, so that he might prevent such meetings. Here, as well as from other sources, we are assured that Oliver only received authority to collect information of the proceedings of the conspirators, and by no means to incite them to illegal acts. We have also the assurance of Mr. Louis Allsop, a distinguished solicitor of Nottingham, that Oliver was in communication with him on the 7th of June, immediately on his return from Yorkshire, and informed him that a meeting was the same evening to take place in Nottingham, and he and another gentleman strongly urged him to attend it, which Oliver did. Mr. Allsop says that Oliver had no instructions to incite, but only to collect information. All this has been industriously put forward to excuse Ministers. But what are the facts? We find Oliver not only--according to evidence which came out on the trials of the unfortunate dupes at Derby--directly stimulating the simple people to insurrection, but joining in deluding them into the persuasion that all London was ready to rise, and that one hundred and fifty thousand from the east and west of the capital only waited for them. We find him not only disseminating these ideas throughout these districts from the 17th of April to the 27th of May, but also to have concerted a simultaneous rising in Yorkshire, at Nottingham, and in Derbyshire, on the 6th of June. Thornhill-lees, in Yorkshire, was on the verge of action, and ten delegates, including Oliver, were arrested. In Derbyshire the insurrection actually took place.