The collection of the Bibliotheca Philosophica Hermetica is divided into the following principal collecting areas: Hermetica, Alchemy, Mysticism, Rosicrucians and Gnosis & Western Esotericism. The guide to the collection, 'Hermetically Open', presents a bird’s eye view of the collecting areas, with select lists of major authors within each area. The colour code attached to each part of the library in the guide easily directs the reader to the relevant collecting area.This guide is concerbed with the modern books (printed after 1800), which are open access and can be consulted in the reading areas.