A very heavy rain which fell while we were at Terni, the fatigue and difficulty of climbing up the Monte di Marmore, from whence this fall appears to the greatest advantage, and our impatience to be at Rome, prevented us from seeing that celebrated cataract, which we regretted the less, as we had frequently seen one of the same kind in Scotland, about twelve miles above Hamilton, at a place called Corace, where the river Clyde, falling perpendicular from a vast height, produces the same effects, in every respect, unless, that he outlives the accident, and continues his course for near fifty miles before he joins the Atlantic ocean. The distance from Terni to Narni is about seven miles; the road is uncommonly good, and the country on each side delightful. When we came near Narni, while the chaises proceeded to the town, I walked to take a view of the bridge of Augustus. This stately fabric is wholly of marble, and without cement, as many other antique buildings are. Only one of the arches remains intire, which is the first on the side of the river where I was; under it there was no water; it is one hundred and fifty feet wide. The next arch, below which the river flows, is twenty feet wider, and has a considerable slope, being higher on the side next the first arch, than on that next the third. The remaining two arches are, in every respect, smaller than the two first. What could be the reason of such ungraceful irregularity in a work, in other respects so magnificent, and upon which so much labour and expence must have been bestowed, I cannot imagine. It is doubtful, whether there were originally four arches, or only three; for that which is supposed by some to be the basis from which the two lesser arches sprung; is thought by others, to be the remains of a square pillar, raised some time after the bridge was built, to support the middle of the third arch; which, on the supposition that there were but three, must have been of a very extraordinary width. This fabric is usually called Augustus’s Bridge, and Mr. Addison thinks that without doubt Martial alludes to it, in the ninety-second Epigram of the seventh book; but some other very judicious travellers imagine, it is the remains of an aqueduct, because those arches joined two mountains, and are infinitely higher than was necessary for a bridge over the little river which flows under them. It has also been supposed, not without great appearance of probability, that this fabric was originally intended to serve the purposes of both.