Distillation, tho’ long practised, has not been carried to the Degree of Perfection that might reasonably have been expected. Nor will this appear surprising, if it be considered, that the Generality of Distillers proceed in the same beaten Tract, without hardly suspecting their Art capable of Improvements; or giving themselves any Trouble to enquire into the Rationale of the several Processes they daily perform. They imagine, that the Theory of Distillation is very abstruse, and above the Reach of common Capacities; or, at least, that it requires a long and very assiduous Study to comprehend it; and, therefore, content themselves with repeating the Processes, without the least Variation. 

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