Swiftly he set about gathering rocks. He planned to form the simple four letter word HELP, with an exclamation point added for emphasis. So engrossed was he in his work that he scarcely noted the unusual volume of noise about him, or if he did notice it attributed it to the small slides caused by his unearthing rocks from their natural formation. Hours passed while he painstakingly formed the shape of an enormous letter "H," a letter fully a tenth of a mile long. Exhausted by the unaccustomed manual labor he straightened up a moment and cast an approving eye across the extent of his handiwork. A gasp rose involuntarily from his throat as a strange sight crossed his line of vision. The land about him fairly swarmed with the peculiar, bony creatures he had encountered the evening before, and as far as his eyes could see there stretched an uninterrupted series of H's, all exactly similar in shape, size and peculiarities of the original! And at the edge of each of the letters sat a puffing group of emaciated, leathery skinned Ganymedians! Their great, watery eyes blinking patiently and soulfully in his direction! He didn't know whether to laugh or to cry. It was impossible to proceed. In order to lay out another letter he would have to accomplish the tremendous task of removing all the other H's as well. He shuddered as he realized that he would have to repeat the process again and again until finally the one word help, with a string of exclamation points miles in length remained. Suddenly a thought struck him. Wasn't this seemingly endless row of huge H's sufficient to attract the attention of any searching party that happened to see it without going to the trouble, double trouble at that, of adding the rest of the letters that spelled out the word HELP? It seemed logical enough to him. With a distinct air of relief he turned away, his arduous task of the past few hours completed, thanks to these freakish creatures that inhabited this moon. * * * * * Again the beginning of the short twilight was progressing and the sun was settling rapidly in the sky--its glare and heat diminishing with each passing moment. The massive bulk of Jupiter above could be seen only as a long, thin, crescent that stretched one quarter of the way across the visible sky. He experimentally lifted his helmet an inch or two. A sharp gust of air scurried hurriedly around the contours of his face and slightly ruffled his hair. He threw the helmet all the way back and with exultation breathed in tremendous gulps of crisp, _fresh_ air. For the first time that day his powerful frame rose to its full six feet of height and he stood statuesque, his shadow cast before him, a symbol of man against the cosmos.