This section is from the book "The London Medical Dictionary", by Bartholomew Parr. Also available from Amazon: London Medical Dictionary.
Or Bergamot, (French). It is a species of citron, produced at first casually by an
Italian's grafting a citron on the stock of a bergamot pear tree, whence the fruit produced by the union participated both of the citron tree and the pear tree, and the plant is a variety of the citrus medica Lin. The fruit hath a fine taste and smell, and its essential oil is in high esteem as a perfume.
The essence of bergamot is also called essentia de ce-dra. It is extracted from the yellow rind of the fruit by first cutting it in small pieces, then immediately squeezing the oil into a glass vessel. This fluid is an ethereal oil.
A water is distilled from the peel by adding the outer rind of three bergamots to a gallon of pure proof spirit, and four pints of pure water: a gallon may be drawn off in a balneum mariae, and as much of the best white sugar as will be agreeable must be added. It may be prepared also by distilling off three pints from the essence of bergamot three drachms and a half, rectified spirit of wine three pints, ammonia prepared a drachm.
 
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