The monkey merely chattered and pushed on ahead. At the farther wall, the original observation of many cracks was confirmed. The wall was broken like an eggshell and Robin could see that dozens of tunnels went out, probably leading to several other bubbles. He decided that the following day he would look for the ones that seemed to lead upward. But it was the time for sleep again. He found a little cave, similar to the ones in which he had made his home, and there he and Cheeky ate their meal, cooking some of the meat from the Moontiger over a small open fire. The meat looked strange in its almost glassy appearance, yet it browned and tasted very good. A thin stream of water meandered out of one of the cracks and from this Robin drank and refilled his canteen. He and the monkey curled up, now fed and contented, and went to sleep. Robin awoke suddenly. He opened his eyes, puzzled. The monkey was screeching somewhere. He sat up, called, "Cheeky!" The little creature dashed back to him. It had been outside the cave and it was excited. It was chattering and complaining as never before. The monkey jumped up and down in a perfect ecstasy of fury. Robin looked at it in wonder. He'd never seen Cheeky so excited. He sat up, looked around. At first he saw nothing unusual. Outside the cave all was quiet. Then he noticed that his food pack had been moved. It had been dragged outside the cave, and its contents pulled out. Robin got to his feet, went to it. Something had come into the cave silently, had taken the sack, and had examined its contents. He looked about, amazed and wondering. Now he saw that other things had been touched. His canteen had been rolled over and the stopper unplugged. The water that had been inside was a little puddle on the cave floor. Alarmed, Robin strung his bow, notched an arrow, and looked carefully around at the surrounding vegetation. Something was there, something big and cunning. His eyes searched the ground and then he saw an outline in water from the canteen. Whatever it was had stepped into the puddle and then walked out of the cave. Robin saw a series of footprints. Something that walked on two legs, something that took steps with a man-sized stride, something with three toes on each foot, that walked upright, was able to open bottles, look into sacks, and spy on sleeping strangers. Something that might well be to the Moontiger and the Moonhound what Earth man was to the Earth tiger and the Earth hound. Moonman! _11. The Glass Man_ The situation was so astonishing that for a while Robin did not do anything but sit down inside his cave and catch his breath. Somehow he had assumed all along that he would not find anything on a human scale on the Moon. His life had been mainly confined to the first cavern-bubble he'd arrived at and this, as he now realized, had been a rather isolated one.