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of soap and its combinations, by giving a short account of the principal alkaline materials most universally made use of in the manufacturing of soap, and how they are to be treated, in order to extract therefrom the leys, or alkaline salts.
Secondly, I have pointed out how the hard materials may be analysed, or examined, in order to detect sand in their composition.
I next proceed to consider the leys, and to shew how they are to be weighed, and proved with regard to their strength, mildness, and causticity; consequently, to determine whether they are, or are not, fit for making soap.
After which I come, in course, to charge the pan, preparatory to a mak-
