the stick and struck again, and Eric's back took fire with the blow. The crowd chanted, "Whips, bring the whips," and fear forced Eric to his feet. He fled then, running on the heedless feet of panic, outstripping those who were behind him until he passed through the great gates into the red dust floor of the canal. The gates closed behind him, and the dust beat upon him, and he paused, his heart hammering inside his chest like a great bell clapper. He turned and looked behind to be sure he was safe. The towers twinkled at him, and the music whispered to him, "Come back, Eric North. Come back to the city." He turned and stumbled back to the great gate and hammered on it until his fists were raw, pleading for it to open and let him back. And deep inside him some part of his mind said, "This is a madness you cannot escape. The city is evil, an evil like you have never known," and a fear as old as time coursed through his frame. He seized the copper hat from his head, and beat on the lotus carvings of the great door, crying, "Let me in! Please, take me back into the city." And as he beat the city changed. It became dull and sordid and evil, a city of disgust, with every part offensive to the eye. The spires and minarets were gargoyles of hatred, twisted and misshapen, and the sound of the city was a macabre song of hate. He stared, and his back was chill with superstitions as old as the beginning of man. The city flickered, changing before his eyes until it was beautiful again. He stood, amazed, and put the metal hat back on his head. With the motion the shift took place again, and beauty was ugliness. Amazed, he stared at the illusion, and the thought came to him that the metal hat had not entirely failed him after all. He turned and began to walk away from the city, and when it began to call he took the hat off his head and found peace for a time. Then when it began again he replaced the hat, and revulsion sped his footsteps. And so, hat on, hat off, he made his way down the dusty floor of the canal, and up the rocky sides until he stood on the Martian desert, and the canal was a thin line behind him. He breathed easily then, for he was beyond the range of the illusions. And now that his mind was his own again he began to study the problem, and to understand something of the nature of the forces against which he had been pitted.