We did not leave Potosi till afternoon. It was a hot August day, and it was dusk before we entered the deep shady valley of Big River. Some delay arose in waiting for the ferryman to put us across the river, and it was nine o'clock in the evening when we reached Mr. Bryant's, at Hazel Run, where we were cordially received. Our host would not let us leave his house, next morning, till after breakfast. We rode to McCormick's, on the Platten, to dinner, and reached Herculaneum before sunset. The distance by this route from Potosi is forty-five miles, and the road, with the exception of a couple of miles, presented a wholly new section of the country. The Mississippi was now low, displaying large portions of its margin, and exhibiting heavy deposits of mud and slime, which broke into cakes, as they dried in the sun. I know not whether these exhalations affected me, but I experienced a temporary illness for a few days during this visit. I recollect that we had, during this time, some severe and drenching rain storms, with vivid and copious lightning, and heavy pealing thunder. These drenching and rapid showers convert the brooks and rills of the mine country to perfect torrents, and this explains one cause of the washing away and gullying of roads and streets, so remarkable on the west bank of the Mississippi. My illness induced me to give up returning on horseback; and I set out, on the 18th of the month, in a dearborn, accompanied by Mrs. Austin. On descending the long hill, near Donnell's, beyond the Joachim, the evening was so dark that I became sensible I must have got out of the road. I drove with the more care a few moments, and stopped. Requesting Mrs. Austin to hold the reins, I jumped out and explored the ground. I found myself in an abandoned, badly gullied track, which would have soon capsized the wagon; but leading the horse by the bridle, I slowly regained my position in the direct road and got down the hill, and reached the house without further accident. Next day we drove into Potosi by four o'clock in the afternoon. This was my second visit, and I now accepted a room and quarters for my collection, at their old homestead called Durham Hall. From this period till the middle of September, I pursued with unremitting assiduity, the enquiry in hand, and by that time had made a cabinet collection, illustrating fully the mineralogy, and, to some extent, the geological structure of the country. I erected a small chemical furnace for assays. Some of the clays of the country were found to stand a high heat, and by tempering them with pulverized granite, consisting largely of feldspar, I obtained crucibles that answered every purpose. Some of the specimens of lead treated in the dry way, yielded from 75 to 82 per cent.