Book 5, Rosecrusians (Secret Doctrine).

The Secret Doctrine of The Rosicrucian's by Magus Incognito, Occult Press Chicago 1949.
The Brothers of the rosy cross, who are the founders, who is Christian Rosenkreuz, what are and were their aims and aspirations? What about the Freemasons?
Much of this book is devoted to the mystery of this subject and many questions, secrets of this organization are answered here.
Symbols and doctrines are covered in this work. It touches on the soul of the world, the universal flame of life,planes of consciousness, progress of the soul,the Aura and Auric colours, and concludes  with what it refers to as The Seven Cosmic Principles.
If you are looking to join the ancient order of the Rosicrucian's you will find to be confronted with disappointment and confusion. The truth is that there is no and never has been any occult order sanctioned by the real Rosicrucian's. The true Rosicrucian's have no formal organization  but are held together by a common interest in the occult and esoteric studies as well as acceptance of fundamental principles of belief and knowledge.
Some of the original teachings of the Rosicrucian's have been incorporated in some of the higher degrees of Masonry.
Much like Martin Luther almost 100 years later, a German Nobleman, Christian Rosenkreuz donned the robes of a monastic order and visited India, Persia, Arabia, and returned bringing with him a secret doctrine obtained from the sages and seers of these mysterious lands. He established the Brotherhood about 1425 but it was kept secret for almost 100 years. We must remember that the Catholic church and the popes were powerful in those days about four generations before the reformer Luther arrived on the scene.
Rosenkreuz translated from German is Rose-Cross..the symbol which is often associated with this occult organisation sometimes represented with a sword and rose, cross and rose respectively.