We follow down the Clyde for some miles, amid pleasing, though not very interesting scenery. There on our left are the ruins of Dumbarton Castle, situated on a cliff, and picturesque amidst their solitary beauty. This was once a fortress, and is the place from which Mary, Queen of Scots, took passage for France when a child. A few miles more, and we arrive at Balloch. This is a little hamlet at the south end of Loch Lomond. This lake covers forty-five square miles, and is one of the Scottish lake-group, corresponding to the Killarney lakes in Ireland. We here embark in a fine little steamer. The lake is not large in appearance, as its small bays occupy much of its area; and in most respects it resembles the upper lake of Killarney, or our lakes George and Winnipiseogee. The water is clear, and the margin prettily wooded; and this end is well studded with islands. There is a grandeur about the highlands of Scotland not to be seen on the Irish lakes. Prominent among the mountains is Ben Lomond, standing out in sublime greatness. It is 3,192 feet high; but, while really lower than some hills at Killarney, its contour intensifies its impression. We appreciate its companionship, and, as we sail on, are constantly introduced to Ben Lomond's companions. Ben Dhu, as it is familiarly called, though the real name is Ben MacDhui, is 4,296 feet high. These highlands are rugged in their outline, and present vast glens, crags, ravines, and broken peaks, being unlike those of southern Ireland, which are generally smooth and rounded. The mountain haze is seen in great perfection, and the hills are well wooded, and exhibit a splendid verdure. There is a peculiar moisture and softness in the air, with a fragrant and stimulating quality. In contradistinction to the Irish lakes, these of Scotland have a bold and masculine appearance. We speak of elegance and nicety at Ireland's lakes, but here we have, added to those qualities, vastness and power reflected from their mountains. We admire Glen Luss, Bannochar, and Glen Fruin, as well as other objects of interest touched upon in the "Lady of the Lake," especially in the rower's song, "Hail to the Chief," for we are at the very scene of the poem. It adds a charm to recall the fact that many a time Sir Walter Scott here sailed and admired; and afterwards recalled his thought,--intensifying it and materializing all, till his verse became a thing of life. Our steamer touches at Landing Luss, on the left, and at Rowardennan on the right; then we cross to Tarbet on the left, and after an inspiring sail of two hours we are at Inversnaid. This is an old fort and a landing. It is of no importance as a fort, but was built in 1713, as a defence against the Macgregors, led by the celebrated Rob Roy.