Sir Walter Scott's residence for some years was No. 39 Castle Street, and a literary Frenchman has remarked that "it was a right number for Sir Walter, as it was fitting that the Three Graces and Nine Muses should take their station there." It was in this house that occurred the ludicrous incident which Sir Walter utilizes in the "Bride of Lammermoor," when he represents the faithful Caleb Balderstone as excusing the non-appearance of dinner by the fact of a fall of soot down the chimney. Sir Walter had invited numerous guests to dinner. As they were chatting together the butler entered with a face like that of him "who drew Priam's curtain in the dead of night." Beckoning to his master he informed him of the catastrophe which had taken place. Sir Walter carried his guests to Oman's Hotel in Charlotte Square, where the mishap added zest to the banquet thus speedily prepared. The castle is not only interesting to Scotland, but to the civilized world. Burns says of it:-- "There, watching high the least alarms, Thy rough, rude fortress gleams afar; Like some rude veteran, gray in arms, And marked with many a seamy scar; The ponderous wall and massy bar, Grim-rising o'er the rugged rock, Have oft withstood assailing war, And oft repelled the invader's shock." Castle Rock, on which it is built, is a very high elevation at the upper end of the Old City, and has the almost undisputed honor of having been occupied by a native tribe long before the Roman Conquest. St. Margaret's Chapel is older than 1373, in which year Sir William Kirkcaldy, who held the fortress for Queen Mary, was compelled by his garrison to surrender to the combined forces of the Scotch and English, but not till after the fortress was laid in ruins. The barracks adjoining the castle--now a portion of the structure, an ugly pile, half house and half factory in appearance--was erected in 1796. This structure being one of the four fortresses of Scotland which, by the Treaty of Union, were to be kept fortified, is always occupied by a regiment of the line. There is but one approach to it, and that is by the main avenue up from the old part of the city, which ends in a square called the Half Moon Battery. This is a level plain of the form indicated by its name, and contains an acre graded with clean gravel. Salutes are fired on public occasions, and a daily gun, at 1 P. M., marks the Greenwich time. This is fired by means of a wire stretching over the city from the Royal Observatory at Calton Hill. The sound can be so distinctly heard on a calm day that it is the regulator of time for a circle of forty miles' diameter. Admittance is gained by passing over a drawbridge across the moat, once filled with water, but now used as a playground by the soldiers. The castle is open to the public on payment of a shilling. The old dark stone walls tower up, castle-like, before us,--sombre, massive, aged, and varied in outline.