...lignite or fossil wood, and is confined to particular strata which were originally shales containing vegetable remains which have undergone "a special...converted into bitumen, when removed by solution, woody fibre remains. — (Proc. Geol. Soc., Lond., May 1860. Hunt.) The theory of the genesis of coal oil...

...anthraciferous, substances. This operation is not attributable to heat, nor of the nature of distillation, but is due to chemical reaction at the ordinary temperature and under the normal conditions of the climate. The proofs that this is the true mode of generation of the asphalt repose not only on...

...substances. This operation is not attributable to heat, nor of the nature of distillation ; but is due to chemical reaction at the ordinary temperature and under the normal conditions of the climate. After the solution and removal of the bitumen from wood passing into asphalt, the remaining...

...special mineralization producing a bituminous matter instead of coal or lignite. This operation is not attributable to heat, nor of the nature of a distillation, but is due to chemical reactions at the ordinary temperature, and under the normal conditions of climate."...

...special mineralization producing a bituminous matter instead of coal or lignite. This operation is not attributable to heat, nor of the nature of a distillation, but is due to chemical reactions at the ordinary temperature, and under the normal conditions of climate."...

...is not attribntable to heat, nor of the nature of a distillation, but is due to chemical reactions at the ordinary temperature, and under the normal conditions of climate." He also describes wood partially converted into bitumen, which last, when removed by solution, leaves...

...special mineralization, producing a bituminous matter instead of coal or lignite. This operation is not attributable to heat, nor of the nature of a distillation, but is due to chemical reactions at the ordinary temperature, and under the normal conditions of climate."...

...special mineralization producing a bituminous matter instead of coal or lignite. This operation is not attributable to heat, nor of the nature of a distillation, but is due to chemical reactions at the ordinary temperature, and under the normal conditions of climate."...

...is not attributable to heat, nor of the nature of a distillation, but is due to chemical reactions at the ordinary temperature, and under the normal conditions of climate." He also describes wood partially converted into bitumen, which last, when removed by solution, leaves...

...bituminous matter has proceeded from vegetable remains which have undergone a special mineralisation, not attributable to heat, nor of the nature of a distillation,...chemical reaction at the ordinary temperature, and under normal conditions of climate. The author then proceeded to state some of the difficulties attaching...