MONDAY MORNING.--At three o'clock we were awakened for the steam-boat, and were not more than half dressed, when the steam ceased from growling, and the bell from tolling; nevertheless, we caught up what garments remained, leaving a few as wind-falls to the chamber-maid, and fled to the dock. The steamer was off, sure enough, but came to, and sent a boat for us, on seeing our signals. It is now broad day-light, and was, indeed, at two o'clock! The sail down Loch Fine is rather tedious. It is a salt-water lake, from thirty to forty miles in length, and the shores are low and barren as the sea-coast. We stopped at several places for passengers, and passing between the isles of Bute and Arran, (celebrated in 'The Lord of the Isles,') we entered the Kyles of Bute, where the shores are verdant and interesting. At the town of Rothsay, on the Isle of Bute, we saw the ruins of the famous Rothsay Castle; and a few miles farther, we passed the Castle of Dunoon, and several pretty summer-villas on the banks of the water. Entering the Frith of Clyde, we stopped at the flourishing ports of Greenock and Port Glasgow, and the strong fortress of Dumbarton, built on a lofty and picturesque rock, at the mouth of the river Clyde. From here, is a fine view of the Vale of Leven, and the whole outline of Ben Lomond, about fifteen miles distant. The pretty vale in the fore-ground is the scene of Smollet's beautiful ode: 'On Leven's banks when free to rove, And tune the rural pipe to love.' In sailing up the Clyde, the most remarkable sight was the immense number of steam-boats which passed us in rapid succession. We met no less than _twenty-one_, of a large class, on the river, all bound out; and I was told that upward of eighty are owned in Glasgow alone. We landed at Glasgow, after a voyage of twelve hours, during which we had stopped at as many different places. I was surprised at the extent and elegance of Glasgow, as much as at its evident importance as a manufacturing and commercial city. It seems to be scarcely second to Liverpool, and is certainly the third city in Great Britain on the score of population and trade.