In its subsequent edition, The Dwellings of the Philosophers ends with a chapter entitled "The Unlimited Paradox of Sciences", which is decidedly hermetic in orientation, although also apocalyptic. According to Eugène Canseliet, this section was added to the previous text and was composed of the material of a third "collection of handwritten notes" that his master, Fulcanelli, had left with him before taking them back in 1928, thereby making it impossible to eventually publish the third book. That book, had it been published, would have been entitled Finis Gloriae Mundi - The End of the Glory of the World. We will see further on what should be kept in mind on this subject. For the time being, suffice it to say that Eugène Canseliet stated with regard to this book: "Undoubtedly, it was about very serious matters"[...]
A few months later, Fulcanelli apparently handed over three parcels sealed with wax to the disciple that he had so patiently trained for the preceding six years. These packages contained Fulcanelli's handwritten notes. Eugène Canseliet stated on that subject much later:
Those were exquisite notes on sheets of paper in various formats. They were not written books.
However, in actuality, those notes indeed represented the substance of three books by the Master, the respective titles of which were written on each parcel concerned. These were: Le Mystêre des Cathédrales, Les Demeures philosophales, and De Finis Gloriae Mundi . The disciple was given the task of formatting those notes and then editing them in literary form in order to produce the first book signed by Fulcanelli: Le Mystêre des Cathédrales. Furthermore, he was instructed to write the introduction, sign it with his own name, and then add to his signature the three initials "F.C.H." for Frère Chevalier d'Héliopolis - a designation which Canseliet was entitled to, even though he had not yet personally achieved the Great Work.
Given the enormity of the task before him, Canseliet was obliged to resign from his position at the Sarcelles gasworks. The conscientious disciple undertook to write on blank, unlined paper, and upon completion of his work, he submitted it via Jean-Julien Champagne to the Master, who expressed his approval and congratulated him. This was in 1922-1923, and the book appeared three years later, in 1926.
Eugène Canseliet then undertook to start work again. This time, with Les Demeures philosophales, which was an even more voluminous task since the text of it was twice as long as that of Le Mystêre des Cathédrales. In the meantime - and again, through the agency of Jean-Julien Champagne - the Master, whom Canseliet no longer met, instructed his disciple to return the text of De Finis Gloriae Mundi to him. Judging from his request, it is likely that the book contained certain revelations which Fulcanelli, after having thought them through in greater depth, realized the fullness of their gravity, and decided against publishing.
Further,
we wish to warn the reader of these lines against any attempt - be it in the present or the future - to publish that text. It would be nothing more than a forgery, for almost all traces of the book in question have completely disappeared. Only a few notes allowing one to determine the outline of the book remain. They reappeared some sixty years later, shortly after the death of Fulcanelli's disciple (we can personally verify this statement. For further details, see "Finis Gloriae Mundi" The End of the Glory of the World in Chapter 11). Indeed, never in his life did Eugène Canseliet ever leave room for doubt on this matter:
It is only for Finis Gloriae Mundi that a few notes were actually written, and they were not included in the parcel with the other notes. I don't know why. I have used those texts, since they were outside, in order to get an idea of what that third book might have been like. What it would have been in actuality, I have no idea. But Fulcanelli wanted the parcel back and he took it from me. Perhaps there were very serious matters in there.
The two texts that were published from these notes appeared in the second edition of Le Mystêre des Cathédrales and in Les Demeures philosophales. They are the chapters dealing respectively with the cyclic cross of Hendaye and the paradox of the unlimited progress of sciences, including "Le Rêgne de l'Homme", "Le Déluge", "L'Atlantide", "L'Embrasement" and "L'Age d'Or".