Our flotilla here broke up, and the persons who had formed its floating community separated, each to pursue his several way, and separate views. I made several acquaintances, whose names are recollected with pleasure. Dr. S. invited me to dine with him, introduced me to his young partner, Dr. Moorhead, and put me in the way of obtaining eligible private lodgings. The three weeks I spent in this city were agreeably passed, varied as they were, by short excursions in the vicinity, including the Licking valley--a stream which comes in, on the Kentucky side, directly opposite the city. I went, one day, to see an experimental structure, built at the foot of the Walnut hills, with a very long pipe, or wooden chamber leading up their sides, and rising above their tops. This was constructed by an ingenious person, at the expense of the late Gen. Lyttle, under the confident hope of his realizing a practical mechanical power from the _rarifaction of atmospheric air_. There was confessedly _a power_, but the difficulty was in multiplying this power, so as to render it practically applicable to the turning of machinery. The ratio of its increase, contended for, namely, the length of the pipe, appeared to me to be wholly fallacious, and the result proved it so. The thing was afterwards abandoned. There was an ancient mound here, which had not then been opened, but which has since yielded a curious ornamented stone, bearing a kind of arabesque figures, not dissimilar, in the style of drawing, to some of the rude sculptured figures of Yucatan, as recently brought to light by Mr. Stephens and Mr. Catherwood. I received, one day, a note from one of the directors of the White Lead Works, above the city, requesting me to visit it, and inspect in detail the processes of the manufacture. The latter I found to be defective in the mode of corroding the lead by the acetic acid; there was also an unnecessary complication and amount of machinery in bringing the oxide into the condition of a good pigment, and putting it into kegs, which had been very onerous in its cost, and was perpetually liable to get out of order. It was during my stay here that I first felt the effects of the western limestone waters in deranging the stomach and bowels, and paid for my initiation into the habit, as all strangers must, by some days confinement. Dr. M. brought me about, and checked the disease, without any permanently injurious effects on my general health.