But all of these were satellites, or (like Jupiter's moons) satellites of satellites. The Sun stood at a writing-desk in the center of the room, quill in hand, calmly making notations in a large, stained, yellowed Book. He was dressed in a long splotched smock with several holes burnt through it, though the hem of a scarlet robe could be seen hanging beneath. His head was encased in a sort of leather sack with a windowpane let into it so that he could see out. Where Daniel stood, that rectangle of glass happened to be reflecting an open furnace-door, so instead of the bulging eyes, he saw a brilliant sheet of streaming flame. A breathing-tube, comprising segments of hollow cane plumbed together by the small intestine of some beast, was sewn through the bag. Isaac had tossed it back over his shoulder. It dangled down his back and ran across the floor to Roger Comstock, who pumped fresh air into it with a bellows. So they must be doing something with mercury this evening. Isaac had observed that quicksilver, absorbed into his body, produced effects like those of coffee or tobacco, only more so, and so he used the breathing apparatus whenever he had begun to feel especially twitchy.