"It's metal, sure enough," answered the child, gazing thoughtfully at the curious thing she had found. "I think it is pure gold, and it must have lain hidden in the sand for a long time. How do you suppose it came there, Billina? And what do you suppose this mysterious key unlocks?" "I can't say," replied the hen. "You ought to know more about locks and keys than I do." Dorothy glanced around. There was no sign of any house in that part of the country, and she reasoned that every key must fit a lock and every lock must have a purpose. Perhaps the key had been lost by somebody who lived far away, but had wandered on this very shore. Musing on these things the girl put the key in the pocket of her dress and then slowly drew on her shoes and stockings, which the sun had fully dried. "I b'lieve, Billina," she said, "I'll have a look 'round, and see if I can find some breakfast." 3. Letters in the Sand Walking a little way back from the water's edge, toward the grove of trees, Dorothy came to a flat stretch of white sand that seemed to have queer signs marked upon its surface, just as one would write upon sand with a stick. "What does it say?" she asked the yellow hen, who trotted along beside her in a rather dignified fashion. "How should I know?" returned the hen. "I cannot read." "Oh! Can't you?" "Certainly not; I've never been to school, you know." "Well, I have," admitted Dorothy; "but the letters are big and far apart, and it's hard to spell out the words." But she looked at each letter carefully, and finally discovered that these words were written in the sand: "BEWARE THE WHEELERS!" "That's rather strange," declared the hen, when Dorothy had read aloud the words. "What do you suppose the Wheelers are?" "Folks that wheel, I guess. They must have wheelbarrows, or baby-cabs or hand-carts," said Dorothy. "Perhaps they're automobiles," suggested the yellow hen. "There is no need to beware of baby-cabs and wheelbarrows; but automobiles are dangerous things. Several of my friends have been run over by them." "It can't be auto'biles," replied the girl, "for this is a new, wild country, without even trolley-cars or tel'phones. The people here haven't been discovered yet, I'm sure; that is, if there ARE any people. So I don't b'lieve there CAN be any auto'biles, Billina." "Perhaps not," admitted the yellow hen. "Where are you going now?" "Over to those trees, to see if I can find some fruit or nuts," answered Dorothy. She tramped across the sand, skirting the foot of one of the little rocky hills that stood near, and soon reached the edge of the forest. At first she was greatly disappointed, because the nearer trees were all punita, or cotton-wood or eucalyptus, and bore no fruit or nuts at all. But, bye and bye, when she was almost in despair, the little girl came upon two trees that promised to furnish her with plenty of food.