The greatest petroleum field, however, was up the Allegheny River, in Northwestern Pennsylvania, and the first wells bored to obtain it were sunk at Titusville, on Oil Creek, in 1859. The early settlers knew of the appearance of oil about the headwaters of the Allegheny in New York and Pennsylvania, and the name of Oil Creek was given a stream for this reason in Allegheny County, New York, and also to the one in Venango County, Pennsylvania. The Indians had long collected the oil on the shores of Seneca Lake in New York, a course that the white settlers followed, and it was for years sold as a medicine by the name of Seneca or Genesee oil. When its commercial value for illuminating purposes began to be recognized, Colonel E. L. Drake went to Titusville to see if it could be obtained in sufficient quantities. He bored the first well about a mile south of Titusville, and on August 26, 1859, the oil was struck at a depth of seventy-one feet. The drill suddenly sunk into the cavity of the rock beneath, and the oil rose within a few inches of the surface. A small pump was introduced which brought out four hundred gallons daily, and then a large pump, increasing the daily flow to a thousand gallons. Soon a steam-engine was applied, and the flow continued uninterrupted for weeks. Titusville had at the time three hundred people. Many wells were sunk in the neighborhood with varying success, and the product of the Oil Creek district became so large that the market could not absorb it, and at the beginning of 1861, with two thousand wells in operation, the price declined to twenty-five cents per barrel. The two great wells were the Empire, originally yielding twenty-five hundred barrels daily, and the Phillips, nearly four thousand barrels. In 1863 the production had slackened, but the uses had expanded, and prices rose proportionately. Vast fortunes were then rapidly made, and as soon squandered. In the first twelve years of the development of this district, which extended over about four hundred square miles, there were taken from some four thousand wells forty-two millions of barrels of oil, which were marketed for $163,000,000. At first it was carried away by the railroads, of which several sent branches into the district, but there have since been laid extensive lines of pipes which convey it in various directions, and largely to New York and Philadelphia for foreign export. When this district was at the height of its yield it produced four hundred millions of gallons a year. ASCENDING THE ALLEGHENY.