With the same right as the modern chemist symbolizes his chemical substances by means of letters; such as _O_ for oxygen, _H_ for hydrogen, _N_ for nitrogen, _C_ for carbogen,[20] etc., which symbols are incomprehensible to those who do not know what they mean; the ancient alchemists expressed the nature of spiritual essences, powers and principles with which they dealt by certain alchemical signs, such as {symbol} for _Salt_, or the substantial principle in all things; {symbol} for _Sulphur_, or the energies contained therein; and for {symbol} _Mercury_, or the principle of intelligence latent in everything, whether manifested or not; but the living essences or states in the universe which become manifested upon these three planes they symbolized by the signs of the planets, as has already been specified above. These principles are eternal; but their manifestations differ according to the plane upon which they become manifest. Thus, for instance, love is eternal, manifesting itself in the kingdom of God as divine self-consciousness; upon the astral plane as affection, desire and passion; upon the physical plane as gravitation, attraction, chemical affinity, etc. The power is always the same; but its action appears different under different conditions. “Above all a physician should know that man exists in three substances. That of which he is made has three aspects. Those three make up the whole man, and they are the man himself and he is they, and out of these three substances he receives all his good and evil concerning his physical body. Thus each thing exists in these three substances, and the three together constitute a body, and there is nothing added to it but the life. If you can see these true substances, you then have the eye by means of which a physician ought to be able to see. To see the exterior only is in the power of everybody; but to see within the interior and discover what is hidden, is an art that belongs to the physician.” (“Paramirum,” _Lib._ I. s.b.) Those who have thus far followed our line of reasoning will now be ready to acknowledge that an understanding of this superior science, the acquisition of whose knowledge requires a life-time spent by a superior mind, and whose practice involves the evolution of superior faculties, is not to be obtained by a few hours’ perusal of a book on Alchemy, and that only those who are practical alchemists are entitled to judge it. Alchemy, far from being an “exploded humbug,” is in fact the noblest object for which all humanity and civilization strives. It is the realization of the highest ideal, a feat which cannot be accomplished by anything less than that ideal itself. H. P. Blavatsky says:—