[Perception Addict]

This book does a great job of summing up the drug climate, or how the middle class felt about drugs, during the early 1800's. It's also interesting because most of the writers who experimented with hashish or opium throughout the Victorian Era cite this book as their inspiration for trying the substances. Even through the first half of the 1900's, this book is cited as the reason for trying nitrous oxide and other substances known to have mind altering qualities.

You could probably call this one of the first solid trip reports that helps others to understand a drug experience.