illumination and added millions upon millions of dollars to the wealth of the United States.
Petroleum as a curiosity, and indeed in a small way as an article of commerce, was no new thing when its discovery in quantities called the attention of the world to this corner of Northwestern Pennsylvania. The journals of many an early explorer of the valleys of the Allegheny and its tributaries tell of springs and streams the surfaces of which were found covered with a thick oily substance which burned fiercely when ignited and which the Indians believed to have curative properties. As the country was opened, more and more was heard of these oil springs. Certain streams came to be named from the quantities of the substance found on the surface of the water, as "Oil Creek" in Northwestern Pennsylvania, "Old Greasy" or Kanawha in West Virginia. The belief in the substance as a cure-all increased as time went on and in various parts of the country it was regularly skimmed from the surface of the water as cream from a pan, or soaked up by woollen blankets, bottled, and peddled as a medicine for man and beast.
Up to the beginning of the 19th century no oil seems to have been obtained except from the surfaces of springs and streams. That it was to be found far below the surface of the earth was discovered independently at various points in Kentucky, West Virginia, Ohio and Pennsylvania by persons drilling for salt-water to be used in manufacturing salt. Not infrequently the water they found was mixed with a dark-green, evil-smelling substance which was recognised as identical with the well-known "rock-oil." It was necessary to rid the water of this before it could be used for salt, and in many places cisterns were devised in which the brine was allowed to stand until the oil had risen to the surface. It was then run into the streams or on the ground. This practice was soon discovered to be dangerous, so easily did the oil ignite.
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