There are several psychedelic alchemy books in the resource section on this site such as Swim's Psychedelic Cookbook which shows you how to extract mescaline, DMT among other substances. It's a fun read even if you don't go to the trouble of making the extractions.
What are you reading? Have you tried anything alchemical these days? There is a great video and pdf on extracting DMT in the DMT forum written by one of our alumni.