"Space fails us to present the speculative views of certain ancient and mediæval occultists... Suffice it that they antedated Darwin, embraced more or less all his theories on natural selection and the evolution of species, and largely extended the chain at both ends. Moreover, these philosophers were explorers as daring in psychology as in physiology and anthropology. They never turned aside from the double parallel-path traced for them by their great master Hermes. "As above, so below," was ever their axiom; and their physical evolution was traced out simultaneously with the spiritual one."