It is now some Years since I first formed a Design of compiling a complete System of Distillation; and accordingly read most of the Treatises on that Subject, and extracted from each what I thought necessary for my Purpose, proposing to supply the Defects from my own Experience. It is, however, more than probable, that this Design had never been executed, had not a French Treatise of Distillation fell into my Hands; but finding in that Book many useful Observations, and a great Number of Recipes for making various Sorts of compound Waters and Cordials, I determined to finish the Work I had begun, being now enabled to render it much more useful than it was possible for me otherwise to have done. 

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