Queen Mary went from Edinburgh to Glasgow, to visit Darnley on his sick-bed. On this visit hinges a mass of accusations against Mary by her enemies. We regret that the passages of Mr. Hosack's book in which he dissects and analyzes all the evidence covering the period from the journey to Glasgow down to the explosion at Kirk-a-field are too long to be copied here. They are masterly, and more thoroughly dispose of the slanders than any statement we have seen. He moreover demonstrates that the queen's journey to Glasgow, heretofore relied on as a proof of her duplicity because she went uninvited, was undertaken at Darnley's own urgent request. It is during this visit to Glasgow that Mary is charged with having written the two casket letters, which, if genuine, certainly would prove her to be accessory to the murder of her husband. With thorough knowledge of Scotch localities, language, customs, and peculiarities, and with a perfect mastery of all the details of testimony, _pro_ and _con_, in existence on the subject--a mastery which Mr. Froude is far from possessing--Mr. Hosack makes the examination of this question of the genuineness of the Glasgow letters with an application of the laws of evidence that enables him--if we may be permitted the homely phrase--to turn them inside out. Contrasted with the sweet, trusting, child-like confidence with which the letters are received by Mr. Froude, Mr. Hosack's treatment of them is shockingly cool. In commenting upon Hume's opinion that the style of the second Glasgow letter was inelegant but "natural," Mr. Hosack remarks that human depravity surely has its limits, and the most hardened wretches do not boast, and least of all in writing, of their treachery and cruelty. Even in the realm of fiction we find no such revolting picture.