Naturally the first use made of the oil obtained in quantities from the salt wells was medicinal. By the middle of the century it was without doubt the great American medicine. “Seneca Oil” seems to have been the earliest name under which petroleum appeared in the East. It was followed by a large output of Kentucky petroleum sold under the name “American Medicinal Oil.” Several hundred thousand bottles of this oil are said to have been put up in Burkesville, Kentucky, and to have been shipped to the East and to Europe. The point at which the business of bottling petroleum for medicine was carried on most systematically and extensively was Pittsburg. Near that town, at Tarentum in Alleghany County, were located salt wells owned and operated in the forties by Samuel M. Kier. The oil which came up with the salt-water was sufficient to be a nuisance, and Mr. Kier sought a way to use it. Believing it had curative qualities he began to bottle it. By 1850 he had worked up this business until “Kier’s Petroleum, or Rock-Oil” was sold all over the United States. The crude petroleum was put up in eight-ounce bottles wrapped in a circular setting forth in good patent-medicine style its virtues as a cure-all, and giving directions about its use. While it was admitted to be chiefly a liniment it was recommended for cholera morbus, liver complaint, bronchitis and consumption, and the dose prescribed was three teaspoonfuls three times a day! Mr. Kier’s circulars are crowded with testimonials of the efficacy of rock-oil, dated anywhere between 1848 and 1853. Although his trade in this oil was so extensive he was not satisfied that petroleum was useful only as a medicine. He was interested in it as a lubricator and a luminant. That petroleum had the qualities of both had been discovered at more than one point before 1850. More than one mill-owner in the districts where petroleum had been found was using it in a crude way for oiling his machines or lighting his works, but though the qualities of both lubricator and luminant were present, the impurities of the natural oil were too great to make its use general. Mr. Kier seems to have been the first man to have attempted to secure an expert opinion as to the possibility of refining it. In 1849 he sent a bottle of oil to a chemist in Philadelphia, who advised him to try distilling it and burning it in a lamp. Mr. Kier followed the advice, and a five-barrel still which he used in the fifties for refining petroleum is still to be seen in Pittsburg. His trade in the oil he produced at his little refinery was not entirely local, for in 1858 we find him agreeing to sell to Joseph Coffin of New York at 62½ cents a gallon 100 barrels of “carbon oil that will burn in the ordinary coal-oil lamp.”