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Updated: May 4, 2025
There is not perhaps one substance in the mineral kingdom by which the operation of subterraneous heat is, to common understanding, better exemplified than that of mineral coal. Those strata are evidently a deposit of inflammable substances which all come originally from vegetable bodies. In this state of their formation, those coal strata must all be oleagenous or bituminous.
If pieces of White Harts-horn be with a competent degree of Fire distill'd in a Glass-retort, they will, after the avolation of the Flegm, Spirit, Volatile Salt, and the looser and lighter parts of the Oleagenous substance, remain behind of a Cole-black colour. And though I remember not that in many Distillations of Harts-horn I ever sound the Cap.
It is an oleagenous substance, naturally evolved from the earth, and may be found in all degrees of thickness, from a very light substance found in some parts of Persia, to a thick viscid substance more indigenous to Britain. Before taking a lease of the petroleum spring, Mr. Young suggested the advisability of Tennant's people taking it up, but they said it was too small a matter for them. Mr.
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