Enigma

This image is from an old book of Martin Ruland, or also named Martinus Rulandus, known for ti's works about Paracelsus and also it's Lexicon of Alchemy "Lexicon Alchemiae", which you can find here : http://books.google.fr/books?id=BhIOAAAAQAAJ&pg=PA328&dq=martin+ruland&as_brr=1&ei=oX1XS-6RJpLoygTx3NTyCA&cd=4#v=onepage&q=&f=false

Looks like a mix of alchemical symbols, Greek alphabet, and seals of entities from old spellbook.

For example, the X like, can be seen like "10" or an A for the Hebrew letter Aleph, also the sign of crucibulum, crucible, X is also for Talc.

The neptune symbol is generaly used to design a calx of metal.

This triangle can be a special sigil in order to bless or protect the reader, the book, the author maybe. The presence of Saturn and Mercury sigils are maybe showing an astrological or alchemical significance.

Any idea is welcome, but do not storm your brain ... :)