The second facility which the forgers enjoyed, arose from their either possessing among them, or having access to, many genuine letters of Mary. This is a circumstance of some consequence, and has scarcely been sufficiently attended to by the various writers on the subject. It at once obviates Robertson's cause of wonder, that the letters should be "filled with a multiplicity of circumstances, extremely natural in a real correspondence, but altogether foreign to the purpose of the Queen's enemies." In all probability, Mary wrote to her Secretary Maitland from Glasgow, and had of course written to him a hundred times before. There is every reason to believe also, that she corresponded with Maitland's wife, Mary Fleming, who had been one of her friends and attendants from infancy. Murray must have had in his possession numerous letters from his sister. Where then was the difficulty of founding these forgeries upon writings which were not forgeries, and of making it almost impossible for any one but Mary herself to detect what was genuine in them from what was fabricated? Many passages might be introduced which Mary had actually written, but which she had applied in some very different manner; and here and there might be artfully interwoven a few sentences which she never wrote, but which seemed so naturally connected with the rest, that they fixed upon her soul the guilt of adultery and murder. There is nothing which ought to be more constantly borne in mind, whenever these writings are read or discussed, than the probability, we might almost say the certainty, that the originals contained parts which had been actually written by Mary, although neither addressed to Bothwell, nor ever meant to be twisted into the sense which was afterwards put upon them; and which appeared the true meaning only, in consequence of their having been so much garbled and disfigured.