The petroleum and natural-gas fields are also nearly all in that valley or on its edges. (I think it was in the narrow valley of La Belle Rivière, which Père Bonnecamp found so dark on that Celoron expedition, that this oil of the rocks was first found.) [Footnote: Natural gas and burning springs were early known to the French pioneers and Jesuits who penetrated the Iroquois country, as the following extracts show: "It was during this interval that, in order to pass away the time, I went with M. de LaSalle, under the escort of two Indians, about four leagues south of the village where we were staying, to see a very extraordinary spring. Issuing from a moderately high rock, it forms a small brook. The water is very clear but has a bad odor, like that of the mineral marshes of Paris, when the mud on the bottom is stirred with the foot. I applied a torch and the water immediately took fire and burned like brandy, and was not extinguished until it rained. This flame is among the Indians a sign of abundance or sterility according as it exhibits the contrary qualities. There is no appearance of sulphur, saltpetre or any other combustible material. The water has not even any taste, and I can neither offer nor imagine any better explanation, than that it acquires this combustible property by passing over some aluminous land."--Galinee's journal, 1669, in "Marshall Historical Writings," p. 209. "... The spring in the direction of Sonnontouan is no less wonderful; for its water--being of the same nature as the surrounding soil, which has only to be washed in order to obtain perfectly pure sulphur--ignites when shaken violently, and yields sulphur when boiled. As one approaches nearer to the country of the Cats, one finds heavy and thick water, which ignites like brandy, and boils up in bubbles of flame when fire is applied to it. It is, moreover, so oily, that all our Savages use it to anoint and grease their heads and their bodies."--"Jesuit Relations, 1657," 43:261. Pierre Boucher (governor of Three Rivers in 1653-8 and 1662-7) thus mentions the mineral products of Canada, in his "Histoire veritable et naturelle de la Nouvelle France" (Paris, 1664), chap. 1: "Springs of salt water have been discovered, from which excellent salt can be obtained; and there are others, which yield minerals. There is one in the Iroquois Country, which produces a thick liquid, resembling oil, and which is used in place of oil for many purposes."--"Jesuit Relations," 8:289.] If we assume that the fields have all been discovered and that the present rate of exploitation is to continue, the supply of petroleum will be exhausted by 1935 (twenty-one years), or, if the present production goes on without increase, in ninety years (_i.e.,_ eighty-six years), [Footnote: Van Hise, p. 48] and that of natural gas in twenty-five years (i. e., twenty-one years from 1914). [Footnote: Van Hise, p. 56.]