Having thus made himself the object of admiration and esteem, his advice was an oracle, to which they had recourse in all doubtful cases of punctilio or dispute, or even of medicine; for among his other accomplishments, his discourse on that subject was so plausible, and well adapted to the understanding of his hearers, that any person who had not actually studied the medical art would have believed he was inspired by the spirit of Aesculapius. What contributed to the aggrandisement of his character in this branch of knowledge, was a victory he obtained over an old physician, who plied at the well, and had one day unfortunately begun to harangue in the pump-room upon the nature of the Bristol water. In the course of this lecture he undertook to account for the warmth of the fluid; and his ideas being perplexed with a great deal of reading, which he had not been able to digest, his disquisition was so indistinct, and his expression so obscure and unentertaining, that our hero seized the opportunity of displaying his own erudition, by venturing to contradict some circumstances of the doctor’s hypothesis, and substituting a theory of his own, which, as he had invented it for the purpose, was equally amusing and chimerical. He alleged, that fire was the sole vivifying principle that pervaded all nature; that, as the heat of the sun concocted the juice of vegetables, and ripened those fruits that grow upon the surface of this globe, there was likewise an immense store of central fire reserved within the bowels of the earth, not only for the generation of gems, fossils, and all the purposes of the mineral world, but likewise for cherishing and keeping alive those plants which would otherwise perish by the winter’s cold. The existence of such a fire he proved from the nature of all those volcanoes, which in almost every corner of the earth are continually vomiting up either flames or smoke. “These,” said he, “are the great vents appointed by nature for the discharge of that rarefied air and combustible matter, which, if confined, would burst the globe asunder; but, besides the larger outlets, there are some small chimneys through which part of the heat transpires; a vapour of that sort, I conceive, must pass through the bed or channel of this spring, the waters of which, accordingly retain a moderate warmth.”