street, New York City, was the chief dealer in the illuminant. The entire petroleum-traffic in 1858 was barely eleven-hundred barrels, most of it obtained from Tarentum. A shipment of twelve barrels to New York in November, 1857, may be considered the beginning of the history of petroleum as an illuminator. How the baby has grown! The price of “kerosene” or “carbon-oil,” always high, advanced to two dollars a gallon! Nowadays people grudge ten cents a gallon for oil vastly clearer, purer, better and safer! One good result of the high prices was an exhaustive scrutiny by the foremost scientific authorities into all the varieties of coal and bitumen, out of which comparisons with petroleum developed incidentally. Belief in its identity with coal-oil prompted the investigations which finally determined the economic value of petroleum. Professor B. Silliman, Jun., Professor of Chemistry in Yale College, in the spring of 1855 concluded a thorough analysis of petroleum from a “spring” on Oil Creek, nearly two miles south of Titusville, where traces of pits cribbed with rough timber still remained and the sticky fluid had been skimmed for two generations. In the course of his report Professor Silliman observed: “It is understood and represented that this product exists in great abundance on the property; that it can be gathered wherever a well is sunk, over a great number of acres, and that it is unfailing in its yield from year to year. The question naturally arises, Of what value is it in the arts and for what uses can it be employed? * * * The Crude-Oil was tried as a means of illumination. For this purpose a weighed quantity was decomposed by passing it through a wrought-iron retort filled with carbon and ignited to redness. It produced nearly pure carburetted hydrogen gas, the most highly illuminating of all carbon gases. In fact, the oil may be regarded as chemically identical with illuminating gas in a liquid form. It burned with an intense flame. * * * The light from the rectified Naphtha is pure and white, without odor, and the rate of consumption less than half that of Camphene or Rosin-Oil. * * * Compared with Gas, the Rock-Oil gave more light than any burner, except the costly Argand, consuming two feet of gas per hour. These photometric experiments have given the Oil a much higher value as an illuminator than I had dared to hope. * * * As this oil does not gum or become acid or rancid by exposure, it possesses in that, as well as in its wonderful resistance to extreme cold, important qualities for a lubricator. * * * It is worthy of note that my experiments prove that nearly the _whole_ of the raw product may be manufactured without waste, solely by one of the most simple of all chemical processes.”