"Listen to me, Joe," said Sandy. "We've all taken chances, but if you get recurrent dreams from every cube you doze near--" "When that happened to me," snapped Burke, "I was eleven years old and had one moment only. And that dream wasn't affected by the others in the cubes that came after it. And anyhow, no matter what happens to Holmes and me, we have to get these things ready for use! I don't know what we'll use them against. I don't know whether they'll be any use at all. But I've got to try to use them, so I've got to try to find out how!" Sandy opened her mouth to speak again. "I'm going off to fret myself to sleep," added Burke. "Holmes will be trying it too. And Keller." "I don't think it's necessary," said Sandy. "Why?" "You found a sort of library of cubes. How useful would they be if one had to doze off to read them? How handy would a manual about repairing a weapon be, if somebody had to take a nap to get instructions? It wouldn't make sense!" "Go on!" said Burke impatiently. "Why not look in the library?" asked Sandy. "As a quartermaster officer, I _think_ I knew that there was a reading-device for the cubes, like a projector for microfilm. It might have been taken away, but also--" "Come along!" snapped Burke. "If that's so, it's everything! And it ought to be so!" They hastened to the vast, low-ceilinged room which was filled with racks of black cubes. They were stacked in their places. At the far corner they found a desk and a cabinet. In the cabinet they found two objects like metal skull-caps, with clamps atop them. A cube would fit between the clamps. Burke feverishly sat a cube in position and put the skull-cap on his head. His expression was strange. After an instant he took it off and reversed the cube. He put it on. His face cleared. He lifted it off. "I had it on backwards the first time," he said curtly. "This is better than dreaming the stuff. This lets you examine things in detail. You know you're receiving something. You don't think you're actually experiencing. We'll get this other reading-machine to Keller, so he can understand the equipment in the instrument-room. Holmes will have to wait." Sandy said, "I can use him. Doesn't it occur to you, Joe, that we've only partly explored the top half of the fortress? We've only looked at what's between us and the instrument-room. There are all the stores--there were stores! And the generators down below. I can lead the way there now!" "What do you know about the weapons?" demanded Burke. "Nothing," said Sandy. "But I know something about the morale of the garrison. When grumbling began, discipline tightened up. And that worked for the men, but the women--" "Women!" said Pam incredulously.