While these events were transpiring at Woodford, William had not been idle in the city. A constant watch had been maintained upon the several premises occupied by the relatives of Newton Edwards, in the hope of detecting some attempt upon their part to communicate with the suspected thief. This at all times is rather a difficult object to achieve, but we have frequently been obliged to resort to this mode of acquiring information from lack of definite knowledge on which to base intelligent action. In order that one of the many of these expedients may be fully understood, a few words in detail may not be out of place. As is well known, the mail of an individual is so sacredly guarded by the laws of the country which govern the postal service, that an attempt to interfere with the letters of another is regarded as a felony and punished with severity. Of course, therefore, no efforts of ours would be directed to the obtaining or opening of any letters which might be mailed to the suspected individual. Our object was simply to obtain the addresses upon the envelopes, if possible, and then to search out the parties to whom they had been consigned. In this instance our manner of proceeding was quite simple, but it required that it should be managed with great care and without exciting the suspicion of any one. For this purpose each of the operatives, detailed for this duty, was provided with a number of envelopes of a peculiar size and color, and all addressed to fictitious persons. Our plan was, that if any one of Edward's relatives deposited a letter in any of the street boxes, the operative should be on hand and be prepared to drop his letter into the box immediately on the top of it. Another operative was then to await the visit of the postman on his round for collection, when he would step up to him and making a pretense of a mistake in the address of a letter which he had mailed, would from its position be enabled to obtain a glimpse of the suspected letters below, and their addresses. This watch was maintained unceasingly for several days without result, and it appeared either that the family were unaware of Edwards' hiding-place, or else that they were fearful of being watched, and avoided communicating with him on that account.