EmpyreanKnight
I just have a problem with Aquarius (air, or possibly water) being associated with sulphur, mercury, and salt.
Same here. Since the element water is also alchemically represented by a wavy glyph (see the second source in my post above), I believe that in this case it represents Water instead of Aquarius, so that all the four glyphs in the Wheel pointing in the cardinal directions are purely alchemical symbols. I think the element water (as opposed to Aquarius) is easier to relate to sulfur, mercury, and salt.