Persian records tell of a “royal stone” found in the head of the _ouren bad_, a kind of eagle; this preserved the wearer from the attacks of venomous reptiles. If a deadly poison had been administered to a person, he would be immediately cured by taking one drachm’s weight of the stone. It thus appears that its virtues were those of the far-famed bezoar.[25] Persia evidently had good store of “wonderworkers” of this kind, for the Persian romance entitled “Hatim Tai and the Benevolent Lady,” written about the beginning of the eighteenth century, recites the marvellous virtue of a stone called the _Shah-muhra_. If this were fastened on the arm the wearer became endowed with miraculous vision and all the gold and precious stones beneath the earth’s surface were revealed to him.[26] For ten centuries or more, countless thousands, although feeling assured of spiritual immortality, were none the less eager to have eternal youth and vigor and the power to peer into the future. Hence Ponce de Leon’s quest for the “Fountain of Youth” in our Florida. But in addition to this, there has ever been an intense desire to find something by means of which gold could be made out of the baser metals, for youth and vigor, if coupled with poverty, are only half-blessings. The search for the “Philosopher’s Stone” appears to have been a more or less aimless pursuit of this end; but there can be no doubt that this search led to the discovery of many new substances and reactions, and helped to lay the foundation of our modern chemistry. Whether the conscious aim of the alchemist was the discovery of an actual stone, or merely the discovery of some process for turning a valueless substance into one of great value, is not clearly ascertainable from the purposely vague and obscure treatises on alchemy. The “Philosopher’s Stone,” the fond dream of so many who delved into nature’s mysteries in the past, does not seem so improbable to-day as it did twenty years ago. The recent discovery of the element radium, which is produced from the element uranium, and the story of the strange and protean changes of radium into helium, neon and argon, according to the environment in which it is placed, have given the death-blow to the old idea of the immutability of the elements. Still, while we have been allowed this peep into the storehouse of nature’s secrets, and are growing to believe that in eons of time the various different elements may have been evolved, successively, from one another, the power to provoke this change at will and in a brief space of time is as yet withheld from us, and may never be given to us, just as little as the power to send messages to the distant spheres, whose bulk, density and composition we can estimate with a considerable degree of accuracy.