Rudolph, the Emperor, seems to have been perfectly satisfied with the success of the alchymist, and would have heaped the loftiest honours upon him had he been disposed to accept of them; this, however, did not accord with his inclination; he, it is said, preferred his liberty, and went to reside on his estate at Gravarna, where he kept open house for all who responded to his invitations. His biographer, Brodowski, who was also his steward, insists, contrary to other writers, that the magic powder was red and not black; that he kept it in a box of gold, and that with one grain of it he could make a hundred ducats, or a thousand rix dollars, generally using quicksilver as the basis of his operations. When travelling this box was carried by the steward, who hung it round his neck by a golden chain; the principal part of the powder, however, was hidden in a secret place cut in the step of his chariot; this being deemed a secure place in the event of being attacked by robbers. He appears to have lived in constant fear of being robbed, and resorted to all manner of precautions to secure his treasure when on a journey; for it is said that he was well known as the possessor of this philosopher's stone, and that many adventurers were on the watch for any opportunity to rob him. Brodowski relates that a German prince once served him a scurvy trick, which ever afterwards put him on his guard. The prince was so anxious to see the wonderful experiments, of which he had heard so much, that he actually fell upon his knees before the alchymist, when entreating him to perform in his presence. Sendivogius, after much pressing, allowed his objections to be overcome; and, upon the promise of secrecy by the prince, showed him what he was so anxious to witness. No sooner, however, had the alchymist left, than the prince entered into a conspiracy with another alchymist, named Muhlenfels, for robbing Sendivogius of the powder he used in his operations. Accompanied by twelve armed attendants, Muhlenfels hastened after Sendivogius, and overtaking him at a lonely inn, where he had stopped to dine, forcibly took from him his golden box containing a little of the powder; a manuscript book on the philosopher's stone; a golden medal, with its chain, presented to him by the Emperor Rudolph; and a rich cap, ornamented with diamonds, of the value of one hundred thousand rix-dollars.