One summer day Iris was paying a visit to Oceanus, her grandfather, and having a most beautiful time riding the crest of the waves on a frolicsome dolphin. The sea was covered with soft, light vapor and when it was time for Iris to go home to the sky in order to be there in time to help light the lamps of the Pleiades, she wrapped herself all about with this fleecy vapor. Still wearing it like a cloak, Iris reached the sky when a most unusual thing happened. It was so cool up there among the clouds that the sea foam turned to raindrops. Iris had to hurry away or she would have been wet through. Leaning over the edge of a cloud bank to see what was happening, she discovered that a shower of rain was falling to cool the earth and comfort it a little in its condition of drought. Iris could travel with the speed of the wind from one end of the world to the other, and after that she busied herself searching for thirsty plants and trying to help them. She would descend to the ocean, a lake or a river, wherever she might be, and carry vapor that was full of water to the sky from which it dropped to earth to nourish all growing things. The farmers looked upon Iris as their most important help, and at last the news of her good works came to the ears of the gods on Olympus. The gods had one messenger, Mercury, who wore wings on his heels and also on his cap. He was so swift that he was detailed to carry out the most difficult and delicate errands of the gods such as taking new suits of armor to the warriors of Greece, guiding the heroes, and even rescuing Mars, the god of war, when he once found himself bound by the chains he had designed for others. But one never knew exactly how Mercury would carry out a commission. He liked to linger with Pan in the woods and forests, giving as an excuse the care of young Bacchus, god of the vine, whom he must guard. So the gods decided that they would have an errand girl who would live on Olympus and leave the habitation of the gods only when it was necessary to go to man as a guide and adviser. That was the high trust which was given Iris by the gods. She had to use her own judgment to quite an extent as to when and where she was most needed by the dwellers of the earth, and how she could best help them. One day she noticed something happening in the kingdom of her grandfather. A ship glided out of a harbor, the breeze playing among the ropes, and the seamen drew in their oars and hoisted their sails. The night drew on, the sea began to whiten with swelling waves, and the east wind blew a gale. The captain gave orders to strengthen the ship and reef the sail but none of the sailors could hear his voice above the roar of the wind and the sea. The cries of the men, the rattling of the shrouds, and the breaking surf mingled with the thunder. Then the swelling sea seemed to be lifted up to the heavens, to scatter its foam among the clouds, and then sink away to the bottom.