The fortifications that formerly surrounded the town are now demolished, and formed into a public promenade for the inhabitants, and are well laid out, with various clumps of trees and shrubs, broad walks, and benches.
Frankfort is a town of great traffic, and is said to contain about 40,000 inhabitants.
Sept. 18th. Left Frankfort at ten o'clock for Mayence, and passed through a fertile sandy country, which is well stocked with grape vines, but the country not much varied; the scenery as we approach Mayence is more picturesque, particularly when we get in view of the town. We pass through a handsome barrack, situated on the verge of the river, proceeding across a long wooden bridge that leads to the town. Opposite to this wooden bridge, are placed seventeen watermills for grinding flour, which were then busily at work.
The town is surrounded by very deep rampart ditches, faced with strong stone walls, a very good promenade, and a number of small gardens with clipt hedges, near the edge of the Rhine, where there is an avenue that extends along its banks formed by large trees of Poplar and Robinias. At a short distance from Mayence, but on the opposite side and close to the banks of the river is a very fine old castellated building, and a small village adjoining, which form a prominent feature in the scenery from the Mayence bridge.
Sept. 19th. Left Mayence per steam packet for Bonn. For the first two hours, we made scarcely any progress, owing to the dense fog, which we were all anxious to see disperse, in order that the beautiful scenery might be seen to full advantage: it was however not before nine o'clock, that the banks of the Rhine were quite clear, when the packet began to make a rapid progress, and passing rapidly along between numerous stupendous rocks, old castles, and small towns situated close by the river side.
The banks of the Rhine are extensively cultivated as vineyards. When we arrived at Katz, which is considered about the middle of the best scenery, we met the other steam packet, coming up at Werlau. The scenery here is truly grand; the high mountainous rocks and old castellated ruins, with the various undulations and other objects, render this region highly picturesque. There is a pretty town close by the water edge, with white houses, and corresponding village on the opposite side, and another appearing just at the extremity of a deep valley in prospect. The old castle called Marksburg, is a prominent object, but to attempt to describe or enumerate all the various features of interest that come under observation in passing along the Rhine, would be an endless task. The scenery at Coblentz is very beautiful, with its bridge of boats across the Rhine, similar to that at Mayence. A large rock called the Stromberg, is very picturesque, with the castellated ruins at the top, and several other rocks of smaller dimensions in its vicinity, nearly opposite to which the Rhine surrounds a small island. This may be considered about the last of the romantic scenery that comes in view, as we pass down the Rhine.
Arrived at Bonn, about five o'clock, where I experienced some difficulty in getting a lodging, in consequence of the great meeting of scientific professors having been here congregated. After at last finding admittance in a hotel, I proceeded to the Botanic garden, which is situated about a mile from the town, surrounding the south and east sides of the university, and containing a very handsome range of hothouses, from three to four hundred feet in length, which also form nearly a line, or a range, with the principle front of the university. The hothouses are in five divisions, and contain an extensive collection of Ferns and Graminea; many of the stove plants were in a very luxuriant state, and looked very healthy. Behind this range is the annual ground, where the different species are cultivated, which appeared to occupy about an acre: there are several low pits placed in this department, for the growth of Cacteæ, and Orchideæ, and other dwarf-growing species; but the collection of Cacteæ and Orchideæ is very limited. Immediately in front of the range of hothouses, is an arboretum of hardy trees and shrubs, much too crowded, and planted too close to the hothouses, and is continued in a manner round the two ends and south side of the garden. Opposite the principal front of the university, is arranged the collection of Herbaceous plants, according to the natural system, but the beds are all of an oblong form, with broad alleys or foot-paths, betwixt them: an extensive collection of the hardy flowering perennial plants was grown in the Herbaceous ground, but the variety of hardy trees and shrubs appeared to be very limited. There were placed along the front of the university several clumps of green-house plants, and orange trees.
The university was formerly a royal palace, but the lower apartments are now devoted to collections of natural history; the length of the front measures eighty eight yards, and appeared to be about square, with an inner court. On my return, I met with professor Treveranes, and gave him a letter of introduction that I had from Sir W. Hooker. I learned from the professor, that the prince of Salm-Dyck was then in Bonn, attending the scientific meeting, and if I did not see him that evening, I should not be able to see him at all; having a letter of introduction to his highness from Sir W. Hooker, and from Mr. Sabine, and being anxious to see the prince, if possible, I made the best of my way back to Bonn, to the hotel where the prince was stated to be residing; but on enquiring there, finding he had gone out, I immediately proceeded in search of the prince to another hotel to which I had been directed. After waiting some time, I found his highness had not arrived, but was expected very soon. I therefore amused myself in looking through several splendid apartments which were then occupied by a large number of ladies and gentlemen, who meet at this hotel or club-house every night, to supper and various amusements. At last I was informed that the prince had just arrived, when I delivered my letters of introduction, and apologised for intruding at that unseasonable time. The Prince appointed me to be with him at nine o'clock the following morning, when his Highness was pleased to give me a letter to his gardener at Salm-Dyck, directing him to shew me the grounds and collections under his care.
Sept. 20th. After my return from the prince, I made another excursion to the Botanic garden, where I again saw the professor Treveranes, who had not accompanied his learned brethren to Cologne, who to the number of about four hundred had departed that morning for that town.
I took a walk on my return from the Botanic gardens round the environs, and was much pleased by the objects of interest that displayed in different directions. The scenery around Bonn is particularly fine, and some good prospects from a hill, at a short distance from the town; but as I intended starting by the early steam packet, I had not time to reach its summit, although very inviting.