The inscription said to have been found on the Smaragdine Tablet and to which reference was made in a former article, and which Dr. Everard refers to as containing the “_Elixir_ of the philosophers,” is further explained by the author of Isis, where it is also said “It is for the Hermetic student to watch its motions, to catch its subtile currents, to guide and direct them with the help of the _Athanor_, the Archimedean lever of the Alchemist.”[82] It is further stated in plain words that this mysterious agent “is the universal magical agent, the astral light, which in the correlation of its forces furnishes the Alkahest, the philosophers’ stone, and the elixir of life.”[83] Now one great advantage to the student who follows carefully these hints is, that he soon discovers certain basic principles which reach far and wide, and in Hermetic language enable him to ascend from Earth to Heaven, and descend from Heaven to Earth, not in a vague, fanciful way, but as applicable to physical phenomena as to philosophical synthesis. These basic principles are not hypothesis, they are the _first principles of Nature_, as manifested in the phenomenal universe, a thread or clue to the labyrinth of phenomena. There is a vast difference between modern and ancient science in regard to the Ether: The former hypothecates it to bridge a gap in phenomena and at once, as if ashamed of its weakness, turns its back upon it. Not so our ancient Hermetic brethren. Modern speculation regarding a fourth dimension of space apprehends the necessity for something beyond the old conception, as does physical science. And yet the latter reaches no solid ground, though the problem lies in the rubbish derived from analytical science, and the necessity which has compelled it to pay tribute. There is a logical, uniform, invariable antithesis in all manifested nature, which at once suggests the unmanifested. Sometimes the change of a letter or an accent in a word or its division into syllables produces wonderful results, _e. g._, atonement, at-one-ment. So here in the phenomenal universe, nothing and no-thing are not synonymous. To say that the ether fills all space, penetrates the densest matter, and gives rise by emanation to the whole phenomenal universe, and yet that it is _nothing_ is nonsense, but that it is no-thing is perfectly true. The ether is to the phenomenal universe what the 0 is to the mathematician, nothing in itself and yet from association, implication or involution, it enters into every form and quantity. Oken has shown[84] that there are really two zeros, or that zero exists as 0+ and 0-, and even here begins the science of symbolism in the ancient _Mathesis_. It is in this shoreless ocean of ether that suns and solar systems are suspended. It is the alkahest or universal solvent from which all forms and qualities of matter and life proceeds, and into which they return. It is luminous, and yet the abode of darkness, the Unmoved Mover of Plato.