I took walks almost daily, on the fine promenade, shaded with lofty trees, festooned with their native vines, along the Beargrass Creek, which is the common place of landing for arks and boats. On one of these occasions, there came in a large ark, which had been freighted at Perryopolis, on the Yioughagany, some thirty miles from Pittsburgh. The two proprietors were K. and K., Marylanders, both young men, or verging to middle life, who had clubbed together the necessary funds, and in the spirit of adventure, resolved on a trading voyage. There was something in the air and manners of both, which I thought I could trust in for an agreeable voyage, especially as they saw in me, not a rival in commerce of any kind, but a mere observer,--a character which I found, on more than one occasion, placed me on grounds of neutrality and advantage. Steamboats are the worst vehicles ever invented by the ingenuity of man to make observations on a country, always excepting the last improvement on locomotive rail-roads. To a naturalist, especially, they are really horrible. Not a tree or plant can be examined; not a shell, or a rock certainly identified. Hundreds of miles are passed in a few hours; the effect of speed is to annihilate space; town succeeds town, and object object, with such rapidity, that there is no distinct time left for observation or reflection; and after the voyager has reached his point of destination, he is often seriously in doubt, what he has seen, and what he has not seen, and is as much puzzled to put together the exact feature of the country's geography, as if he were called to re-adjust the broken incidents of a night's dream. I had yet another objection to this class of boats, at the era mentioned. Their boilers and machinery were not constructed with elaborate skill and strength; their commanders were often intemperate, and a spirit of reckless rivalry existed, whose results were not infrequently exhibited in exploded, sunk, or grounded boats, and the loss of lives.