This offender was a victim to his own feelings of superstition. At the time of his crime and execution the belief in witchcraft was almost universal, and Colley was hanged for the murder of a poor old woman named Osborne, whose qualities as a witch he tested by ducking her in a pond until she was dead, thereby indisputably proving to the satisfaction of all, and to the credit of the deceased woman, how unjustifiable were the suspicions which had been entertained of her character. The evidence given against the prisoner was to the following effect:--On the 18th April, 1751, a man named Nichols went to William Dell, the crier at Hemel Hempstead, in Hertfordshire, and delivered to him a paper to the following effect, which was to be cried: "This is to give notice, that on Monday next, a man and woman are to be publicly ducked at Tring, in this county, for their wicked crimes." This notice was given at Winslow and Leighton-Buzzard, as well as at Hemel-Hempstead, on the respective market-days, and was heard by Mr. Barton, overseer of the parish of Tring, who being informed that the persons intended to be ducked were John Osborne, and Ruth his wife, and having no doubt of the good character of both the parties, sent them to the workhouse, as a protection from the rage of the mob. On the day appointed for the practice of the infernal ceremony, an immense number of people, supposed to be not fewer than five thousand, assembled near the workhouse at Tring, vowing revenge against Osborne and his wife, as a wizard and a witch, and demanding that they should be delivered up to their fury. In support of their demands they pulled down a wall belonging to the workhouse, and broke the windows and window-frames. On the preceding evening the master of the workhouse, suspecting some violence from what he heard of the disposition of the people, had sent Osborne and his wife to the vestry-room belonging to the church, as a place the most likely to secure them from insult. The mob would not give credit to the master of the workhouse that the parties were removed, but, rushing into the house, searched it through, examining the closets, boxes, trunks, and even the salt-box, in quest of them. There being a hole in the ceiling, which had been left by the plasterers, Colley, who was one of the most active of the gang, exclaimed, "Let us search the ceiling;" and this being done, but of course without success, they swore that they would pull down the house, and set fire to Tring, if the parties were not produced. The master of the workhouse, apprehensive that they would carry their threats into execution, and unmindful of the safety of the unfortunate wretches whom it was his duty to protect, at length gave up their place of concealment; and the whole mob, with Colley at their head, forthwith marched off to the church and brought them off in triumph. Their persons secured, they were carried to a pond, called Marlston Mere, where they