The slightest error in pushing or steering the boat exposed her to be thrown across the current, and to be brought sideways in contact with rocks which would mean her destruction. Or, if she escaped injury, a crew who had let their boat swing in the rapids would have lost caste. A boatman who could not boast that he had never swung or backed in a chute was regarded with contempt, and never trusted with the head pole, the place of honor among the keel-boat men. It required much practice to become a first rate boatman, and none would be taken, even on trial, who did not possess great muscular power."[50] Under certain circumstances it was serviceable to catch hold of the bushes and trees on a river's bank and pull a keel-boat upstream; this was commonly known as "bushwhacking" and was particularly useful in times of high water. The number of keel-boats on the Ohio was not as large, probably, as would be supposed. It is on record that from November 24, 1810 to January 24, 1811--two winter months--twenty-four of these craft descended the "falls" of the Ohio at Louisville. It is probable that at this time there were not over three or four hundred keel-boats regularly plying the Ohio and its tributaries. The narrowness of the keel-boat, it will be noted, permitted it to ply far up the larger tributaries of the Ohio and to a considerable way up its smaller tributaries--territory which the barge and flat-boat could never reach. It is probable, therefore, that the keel-boat brought much territory into touch with the world that otherwise was never reached save by the heavy freighter and the pack-saddle; indeed it is probable that this was the greatest service of the keel-boat--to reach the rich interior settlements and carry their imports and exports. The place of the keel-boat is now taken by such packets as the Greenwood and Lorena which bring to Pittsburg the produce of such valleys as the Kanawha and the Muskingum. In this connection it is proper to emphasize a fact suggested elsewhere: that the inhabitants of the Central West, from the earliest times until today, have found the favorite sites of occupation to be in the interior of the country, beside the lesser tributaries of the Ohio.[51] Thus as the pioneer settlements spread up on the Licking, Muskingum, Hockhocking, Scioto, and Miami, a boat like the keel-boat, which could ply in any season of the year and on the narrow creeks and "runs," was an inestimable boon. Again, take for instance the salt industry, which in the day of the keel-boat was one of the most important, if not the most important, in the Central West; as values were a century ago the best of men did well to "earn his salt." These salt springs and licks were found at some distance from the main artery of travel, the Ohio, and it was the keel-boat, more enduring than the canoe, and of lighter weight and draught and of lesser width than the barge, which did the greater part of the salt distribution, returning