The much darker accusation against Buchanan, that he was a party to, or indeed the most active agent in, the forging of certain letters reported to have been sent by Mary to Bothwell before Darnley's murder, and known far and wide as the Casket Letters, seems to rest upon nothing but conjecture. He was one of the few members of the party who possessed the literary gift, the only one, perhaps, except Lethington, whom Mr. Skelton has presented to us as not only a very enlightened statesman, but at all times the faithful servant of Mary, but who is accused by earlier writers of much tergiversation and falsehood. He it was, according to Chalmers, who was the forger, reaching the summit of wickedness "in forging his mistress's handwriting for the odious purpose of convicting her of the crime of aggravated murder." Chalmers was as sturdy a champion of Mary's innocence in the eighteenth as Mr. Skelton is in the nineteenth century, but the conduct of historical research has very much altered in the meantime. The changes have been rung between Lethington and Buchanan by various critics, but the last light upon the subject seems to be that there is none, and that if the letters were forged the forger at least cannot be identified by any art known to history. It is unnecessary to pursue the question, or to bring further arguments to prove that nothing else in Buchanan's writings indicates the possession of such dramatic and constructive power as would be necessary for the production of such a letter as that professedly written from Glasgow, which is by far the most important of the contents of the Casket. A woman's distracted soul, divided between passion and shame, the very exaltation of guilty self-abandonment and the horror of conscious depravity and despair, is not a thing which can be imagined or embodied by the first ready pen, or even able intellect. No one of all the tumultuous band that directed affairs in Scotland has given us any reason to suppose that he was capable of it. Its very contradictions, those changes of mood and feeling which the most ignorant reader can perceive, are quite beyond the mark of ordinary invention. Mr. Froude has said that only Shakespeare or Mary Stewart could have written it--at all events the writer, supposing it to be forged, must have been of unquestionable imaginative genius. It is one of the most wonderful compositions ever given to the world. We look on with awe while those dark secrets of the heart are unfolded. The revelation is too tremendous, too overwhelming, and far too true to nature, to call forth mere horror and condemnation. It is a proof of the often-repeated statement that could we but see into the heart of the greatest criminal pity would mingle with our judgment. Nothing could be more criminal and horrible than the acts therein anticipated, yet we think it would be impossible for any unbiassed mind to read this letter for the first time