I haven't actually got around to reading Mystery Of The Cathdrals cover to cover again but this is the second time Fulcanelli implies a deeper link between gothic architecture, alchemy and specifically Solomnic magic
'The Labyrinth of Solomon...is a cabalistic figure found at the head
of certain alchemical manuscripts and which is part of the magic
tradition associated with the name of Solomon.'
The first time he implies a 'phonetic Cabblah' or bird language link between 'gothic' and 'goetic'
twitter.com/UnconsciousAby…
He also discusses the origin of the word Gothic and seems to imply that the Cathedrals were not only alchemical 'textbooks in stone' but perhaps grimoires