I have never seen a health warning on a book before but I have been asked to provide one here. Some of the ingredients used in these procedures are toxic to say the least. For instance, the recipe for Ching's Brown Worm Lozenges on p40 contains the line: 'Each lozenge should contain half a grain of mercury.' Now, times and attitudes may change but mercury does not. As a record of how things were done the volume is fine but as a recipe book danger lurks in these pages. Unless you are very, very sure of what you are doing please treat this as a reference book, not a practical guide.

More mundane note at the end of the book.