Foam of Mars

Meaning

The Hermetic judgement first says no philosopher has publicly disclosed the universal subject’s name, then tells its friend that it is a certain salt or foam of Mars. The juxtaposition provides a designation without plainly resolving the secrecy it has just asserted. Mars carries the vocabulary’s metallurgical resonance, but the supplied passage does not identify a modern compound or establish exactly what “foam” denotes. The reader should retain the deliberate indirection instead of treating this suggestive name as a transparent laboratory label.