Hannah Glasse, The Complete Confectioner (1800)
“ The first, called distilling per ascensum, that is to say, by raising, is made by placing the still on the fire or other hot matters, such as gravel, horse dung, boiling water, &c. which promotes a rising of the spirits. This method is the most common and almost the only one distillers put in practice. The second called per descensum, that is to say, by depressing or defrauding, is procured by placing the fire on the top of the vessel employed in distilling which precipitates the spirits. This method is used by the liquorist distillers but for the oils of cloves, nutmegs, and mace. ”
