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had an opportunity of being properly instructed in the fundamental principles of Soap-making.
These principles the Author considers to be a thorough knowledge of the nature and qualities of the original materials, leys, &c. used in the manufactory. It may in general be observed, that all bodies possessing a fixed alkaline salt, may be rendered useful in the making of Soap; but the chief, and what is commonly resorted to, are the following, viz. Kelp, Barilla, American and St Peterburg, Pot and Pearl Ashes, Dantzic, English, &c.; with a short Account of which, from the best authorities, we shall commence this Treatise, and conclude the whole with a brief Dissertation on Spoiled Hard Soap, &c.
