For anyone who may be interested in Apothecaries and what they did, I have just come upon the following: http://www.thegarret.org.uk/pdfs/exhibitions/apothecary.pdf, by Kevin Flude and Paul Herbert. It is well worth reading, although the Recipe for Snail Water at the end is a little disgusting. Its only saving grace would be if it worked!.
murreyandblue 
They seem to have made an awful lot of it if the quantities are anything to go by!
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