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Rh the port of Pittsburg was 63,221 tons; of this, 41,533 tons was export. In 1837 the total number of boats arriving at Pittsburg from February 10 to July 1 was five hundred and ninety-three; the total number departing was five hundred and eighty-two. If the upstream trade did not equal the downstream trade in the days of steamboats, it can be readily imagined how great was the difference in the days of rowed and pushed craft. Upstream traffic began to thrive with the founding of Pittsburg and other cities in the upper Ohio Valley. A market was then created, and the product of the lower valley began to ascend.

Thus dawned the era of the famous keel-boat, the first craft of burden that plied to and fro on western waters. True, the name was applied to craft that came earlier. Colonel Burd, the English officer who led one of the marauding expeditions from Detroit into Kentucky in the Revolutionary War, came from the lakes and ascended the Licking in keel-boats. It is given on good authority that Tarascon, Berthoud and