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I had given almost three quarto pages upon that subject, endeavouring to explain how all the different degrees of infusibility were produced, by means of heat and distillation, in strata which had been originally more or less oily, bituminous, and fusible; and now our author says, that it is incomprehensible to him, how coal, an infusible substance, could be spread into strata by mere heat.
The infusibility of this substance renders it greatly superior to platinum for purposes of the electric light. Near the beginning of the present century it was discovered by Sir Humphry Davy that carbon points may be rendered incandescent by means of a powerful electrical current.
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