...confined to particular strata which were originally shales containing vegetable remains ; these have undergone " a special mineralization producing a bituminous...temperature, and under the normal conditions of climate." He also describes wood partially converted into bitumen, which last when removed by solution leaves...

...confined to particular strata which were originally shales containing vegetable remains ; these have undergone " a special mineralization producing a bituminous...temperature, and under the normal conditions of climate." He also describes wood partially converted into bitumen, which last when removed by solution leaves...

...confined to particular strata which were originally shales, containing vegetable remains. These have undergone " a special mineralization, producing a...temperature, and under the normal conditions of climate." He also describes wood partially converted into bitumen, which last, when removed by solution, leaves...

...confined to particular strata which were originally shales containing veg• etable remains ; these have undergone " a special mineralization producing a bituminous...temperature, and under the normal conditions of climate." He also describes wood partially converted into bitumen, which last, when removed by solution, leaves...

...mineralization producing a bituminous matter instead of coal or lignite. This operation is not attribntable to heat, nor of the nature of a distillation, but...temperature, and under the normal conditions of climate." He also describes wood partially converted into bitumen, which last, when removed by solution, leaves...

...defective ; for though that writer implies that the beds of vegetable matter undergoing conversion by chemical reactions, at the ordinary temperature, and under the normal conditions of climate, become a solid bitumen identical with the fluid of the " pitch-lake," yet, we fail, on referring to...

...confined to particular strata which were originally shales containing vugetable remains ; these have undergone " a special mineralization producing a bituminous...temperature, and under the normal conditions of climate." He also describes wood partially converted into bitumen, which last, when removed by solution, leaves...

...subsequently made, that wild animals were sometimes mired and died in the tarry oil springs in that State. Of the origin of petroleum there are different opinions....materials directly into oil and kindred hydrocarbons. The facts cited in proof are, that oil is found in the cavities of fossils (Orthocerata, &c.), and...

...defective; for though that writer implies that the beds of vegetable matter undergoing conversion by chemical reactions, at the ordinary temperature, and under the normal conditions of climate, become a solid bitumen identical with the fluid of the "pitch-lake," yet we fail, on referring to the...

...defective ; for though that writer implies that the beds of vegetable matter undergoing conversion by chemical reactions, at the ordinary temperature, and under the normal conditions of climate, become a solid bitumen identical with the fluid of the " pitch-lake," yet, we fail, on referring to...